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1.
An ass or boob grab of a significant other or close companion, which happens so quickly that knowledge of the incident is exclusive to the two parties involved. As such, a QTIP cannot be classified as PDA.

Note that it is acceptable to yell aloud "QTIP!" and then proceed to initiate a QTIP. Also note that it is not acceptable to QTIP a complete stranger.
"Ugh, I really want to make out with you right now, but you know I don't like PDA"
"How about a QTIP (Quick Touch in Public)?"
by Grabestone October 02, 2012