sacktapping 

touching one's genitals. can be used in various circumstances, e.g. sacktapper, sackmacker, sackslapper, et cetera. often used to insult one or to denote someone as a good friend.

didn't you, you sackTAPPER?

sacktapping by Ryan September 22, 2003

sack-tapping 

aka tea bagging or chest humping;
a gamer term in First Person Shooters or 3rd person shooters when one crouches over anothers body repeatedly to give the immpression of humping their dead body; is usually used to mock one with a bad gamertag,who is camping or is just plain annoying. Often the players that sack-tap are the most annoying anyways.

1. "Dude, look at this gaywad's gamertag! Pannfle. I am gonna start sack-tapping the hell outta this bitch."
2. These kids are so gay. They keep sack-tapping me!

sack-tapping by DoesntLikeGears March 25, 2009

stacknapping 

verb - when two (or more) people or animals (or a combination thereof) sleep for a short time in an orderly pile, one atop the other, for maximum photogenicity

Can’t wait to get home and get my stacknapping on with the mister.

This won't take off like planking and owling did. Stacknapping requires more than one foreveralone redditor.

My boyfriend would punch me if I tried to stacknap on him like that.

stacknapping by Droopy Icer August 14, 2011