When one bro exchanges a manly spanking to his fellow bro after a job well done. Does not necessarily need to be in the context of an athletic event. An athletic butt tap can be exchanged for any reason without being seen as homosexual. Athletic butt taps are firm but not overly powerful or aggressive.
Ross: Dude did you just slap my ass?
Chase: No man it was an athletic butt tap.
Ross: Oh okay nice man!