Co to znamená "mlžit"?

= to doubletalk, beat about the bush 

E.g. Ministr neřekl nic konkrétního, jen tak mlžil. (The minister didn't say anything particular, he was just beating about the bush.)

• literally: to make fog 
• the perfective form is zamlžit, another imperfective form is zamlžovat 
• it is used also with the literal meaning - e.g. when you spray plants; or with "se" = mlžit se / zamlžit se / zamlžovat se (to get misty)
• related vocabulary:
• mlžení = waffle, beating about the bush, doubletalk
• mlhavý = foggy, misty; vague, foggy
• mlžný = foggy, misty
• mlhavě = vaguely - e.g. Mlhavě si vzpomínám. (a synonym possible in this sentence: Matně si vzpomínám. = I vaguely remember)
• mlhavo = foggy (about weather) - e.g. Dneska je pěkně mlhavo. (= It's pretty foggy today.)
• mlha = fog, mist, haze (possible to say "mlžný opar" for the last one) - e.g. Venku je hustá mlha. = Venku je mlha jak mlíko! (There's thick fog outside. - the second is colloquial - literally: There's fog like milk outside.)
• mlhovka = světlo do mlhy = fog light
• zamlžený = steamy, misted, fogged (e.g. Mám zamlžené brýle, nic nevidím! = My glasses are misted, I don't see anything!); obscure, hazy

Co to znamená "celkem vzato"?

= all in all, all things considered, generally speaking

Co to znamená "Teče mu do bot"?

= He's in dire straits. His situation is bad.

• Literally: It's leaking to him to shoes. = Water's leaking into his shoes.
• Similar:
• Má to nahnutý. (He's on a slippery slope.)
• Hoří mu termín. (His deadline's "burning" - he has to finish something quickly.)
• Other phrases with "boty":
• Kominík byl černý jak bota. (The chimneysweep was as black as a shoe.)
• Práskl do bot. = Vzal do zaječích. (= Utekl. = He took to his heels. He ran away.)
• Udělal pěknou botu. (He made quite a blunder.)
• Znám to tady jako své boty. (I know it here like the back of my hand.)
• Bonus: pohádka Kocour v botách

Co to znamená "Bez legrace!"?

= Seriously! No kidding!

Co to znamená "Tak ať!"?

= So be it! So what! I don't care!

Co to znamená "To je ňáký divný!"?

= It stinks! It's fishy!

• Literally: It's kind of weird!
• Vocab:
• ňáký = nějaký = some, kind of
• divný = podezřelý, pochybný, zvláštní, nenormální
• It's colloquial - it'd be "To je nějaké divné!" in standard Czech
• Alternatives:
• To se mi (nějak) nezdá! (It kind of doesn't seem right!)
• Tady něco nehraje! (Something doesn't add up/fit here!)

Co to znamená "To se mi snad jenom zdá!"?

= You gotta be kidding me! You must be joking!

= I don't believe that, that can't be happening

• Literally: I must be just dreaming! It must only seem to me!
• Vocab: 
• zdát se = to seem / appear, but also to dream
• snad = probably, perhaps, hopefully
• jenom = only, just
• Alternativy:
• To snad není možné! (It can't be possible!)
• To si děláš legraci / srandu (colloquial) / prdel (vulgar)! (You're kidding!)
  (= ty-form, vy-form = děláte)
  

Co to znamená "dyžtak"?

(or kdyžtak, read "gdyštak") 

= Když... tak (literally: if... then)

= possible, if you can, if anything happens... (colloquial)

Např. (E.g.):

• Můžeš mi dyžtak zavolat? (Could you possibly call me?)
• Já ti dám dyžtak vědět, jo? (I'll let you know if you need / if anything changes / if it's necessary.)
• Dyžtak to nech být. (Let it be / Leave if you want / if you need...)

Co to znamená "Ani nápad!"?

= No way! Not likely! 

• Literal translation: Not even an idea!
• Other possible versions: 
• Ani mě nenapadne! (Literally: It won't cross my mind. Real meaning: No way I'm doing it!) 
• Ani za nic! (Literally: Not even for nothing. Really: Not for anything! = You can offer whatever you want, I won't do it.)
• Other phrases with "nápad": 
• To je dobrý nápad. (It's a good idea.) 
• To je nápad! (= That's a great idea!) 
• Mám nápad! (I have an idea! I know what.) 
• Dostal/a jsem nápad! (I got an idea! I hit upon an idea!) 
• To je ale nápad! = To jsou nápady! (What a silly idea! The very idea!)