Mate-moi ça

mater is an interesting and useful verb with several meanings:
1/ to overcome, bring under control
la révolution a été matée = the revolt was put down
je vous materai, moi! = I'll show you who's boss!

2/ slang for to look, to spy on
il matait les filles sous la douche = he was peeking at the girls in the shower
mate! = look!

3/ in chess, to checkmate, although rarely used as a verb
Checkmate! = Echec et mat! or just Mat! (the 't' is not silent in this case)