A rake is when you take all three pots no matter if you slick someone or everyone drops but you.

Ex:

Berber: Nice! Fucking raked it!

Ben: No you didn't squirrely, I'm still in.  Now pick up your three off suit and take three freshies.

Berber: Three freshies please.

Ben: One

Berber: Shit....

Ben: Did you pick up any trump?

Berber: Fuck me! (throws his cards down revealing 3 more off suits)

Ben: See Berbs, now I raked it you dumb poodle.