finger my beef

To get in somebody else's problem, interrupt in some way. Usually derogatory, because unless you are asked, you shouldn't butt in.

1: "Yeah, so I'm having issues with..."
2: "What? What?! Tell me, I know what to do!"
1: "Dude. Don't finger my beef. Go kill yourself or something."

witty

Being clever and funny, making funny quips off the top of your head. Witty people are clever and cool. Hang out with them.

He is so witty... I think I am in love.