Watcha is a lame-arsed catchphrase from that illegal immigrant Mexican comedian guy that basically means: with cheese. Along with I got this, tambien and a bunch of other crap, that I am too lazy to list here.

George Lopez Using WatchaEdit

Max, clean the sink and stuff, watcha
Donald Trump, watcha up!
WAAAAAAAAAAATTTTTTCCCCCCCCCHHHHHHHHHAAAAAAA!

In summery, he uses this crappy thing all the time.