(informal) guess what, what do you know

(informal, Belgium) to keep updated, to keep informed [+ à (someone)]

(informal) or what?

Indicates the speaker's impatience at being faced with the return of someone or something they believed settled: what now? now what? what is it now? what is it this time?

(informal greeting) what's new, what's up, how's it going

(informal) you're welcome (after being thanked)

(informal) what good is it? what's the good of? what's the point?

(informal) why? what for? to what end?

failing that; otherwise

you know what? (a phrase used to get someone's attention before announcing something)