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1.
A play on the technology term for cell phone "apps"(applications) --similar to the more vulgar version of "tap that ass" or "you wanna tap that?"
I'd like to tap that app
by zambini December 31, 2010
 
2.
Telling someone in public or mixed company that you had sex with that girl (or guy) that you had been dating or had your eye's on for awhile.
Guy 1: How did the your date go with the girl you met three weeks ago?

Guy 2: It was awesome. We go back to my place and I got to tap that app.
by soadfreak3284 August 21, 2011