When a female places her bare vagina on the forehead of a sleeping or passed out victim; the female version of "teabagging"
When Chris passed out on the couch after drinking too much, Erica dropped her drawers and gave him a tuna dip.
by Smaps February 04, 2010
Tuna Dip is the female version of "tea bagging". Essentially it is the same process as a "tea bag" except with the genitalia of a female.
by 1337rubberduckie March 28, 2010