"Don't know function..."

My math teacher's hilarious. But hilarious in the unintentional way. It's just I find his mannerisms and speech as quirky- and it's not just me. Guess what? His name's Shahab Shahabi. I had so much fun saying his name hahaa... Anyways, he has this Middle Eastern accent (similar to Indian, I guess, but I know it's not Indian), and omg, the things he says! He says "x squared" like "ex-ah-squared", and he says things short, to the point, and some of what he says reaches the point of hilarity.
We were doing arctan functions.. He's telling us we have to know and memorize what the functions look like, basically so we can do the problem. And he adds-
Prof: Don't know function, you're dead.
Class: *laughter of the "what?!" o.0 variety*
Prof: *waits for laughter to subside* O-kay, not dead, but you lose.

Haha, w/ his accent, he says it all fast and no-nonsense-like.

And then there're some moments I just have my own little one-person laughing party. I supposed the prof meant "Put the argument on solid grounds/foundations", but what he actually said was "Put argument on solid feet."
Oh mannnn... I couldn`t help it! hahahhahahaaaaaaaaa