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1.
When someone tries really hard to flirt with someone. Not to be confused with the common word "macking".
Coleen is macing so hard on Greg. Theyre gonna get it donnnne
by BoLasha November 17, 2008
 
2.
to be making out hard on some people
i was macing on that chick hardcore last night.
by boomboom powguy June 03, 2010