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1.
It means keeping your cool. Don't do anything stupid to make yourself look fooish, or uncool.
Phill: "Oh my gawd, what the hell am I going to do?"

Steve: "Dude, ACE TO FACE, you'll be alright!"
by el_chino March 12, 2009
 
2.
sticking hand down pants and putting it in someones face
i aced markus.
by servais October 04, 2003