He doesn't understand one of those words, but he gets the vague meaning by means of inference.

And now the angel is getting a vague sort of glare. Vague, because he hasn't had time to shake of all of the effects of said drug yet.
"You had something to do with that?" He doesn't remember this... guy? Most likely guy, at the party... but then, he doesn't remember a fair amount of the party.

He gets the impression this might be a good thing.