A sexual position where two females lay on each other back to back. One famale is on all fours while the other lays back to back on top of her. The male can finger one and use his dick on one, rotate using his dick, eat both out, or eat one and finger one.
Guy: Dude i hung with these smokin hot chicks last night and eventually convinced them to let me get em in a back stack.
Guy's friend: Nice dude! Lemme know next time and maybe we can tag team.
Guy's friend: Nice dude! Lemme know next time and maybe we can tag team.
by ARandomWhiteGuy May 8, 2009
by Ace Monroe June 1, 2017
To "bring them stacks back" is rarely performed by someone of high placement. Usually someone of high status will throw money in a strip club and gets a majority of it back because of their heavy influence on women.
A man in the strip club is throwing money and making it rain on a stripper; he later takes her to the vip section where other things go on, and he ends up getting a large portion of his money back from "putting her on" or by having her "bring them stacks back". He basically is a smart pimp!
by John Doe So Real December 1, 2013