The art of having a threesome with two guys and one girl, in which one guy is doing her from behind, while she gives the other guy a blowjob while he is taking a shit. During this process, both guys are high-fiving to make a Eiffel Tower shape. Basically, its the offspring of a Eiffel Tower
and a Blumpkin
Nick to Ryan and Sarah: I have to take a shit, do you guys want to come with and do a Bleiffel Tower?
Sarah: I love giving out Bleiffel Towers!!
Ryan: Yeah bro why not?! I too love Bleiffel Towers!!!