Sexual act requiring 4 people. Person 1 sits backwards on the toilet while defecating and gives a blowjob to person 2, who is defecating in the tank of the toilet. Person 1 also gives hand jobs to persons 3 and 4, who are standing on either side of the toilet. Person 2, 3, and 4 high five above person 1's head.
The combination of the double blumpkin supreme, the upper decker, the pterodactyl, and the eiffel tower
Tom: Dude, I saw the nastiest thing, this chick was doing the "double blumpkin upper decker dactyl tower" at that party on Saturday night.
Ted: Wow she must be a freak!
Tom: Yeah, I almost puked!
Performing the ol' reach around on yourself, an advanced masturbationtechnique. Word origins can be traced to dudefuckinghellyeah (DFHY) at burning man 2009.
The stranger is getting old, I think today I'll change things up and pull a dactyl backjack when I'm wanking.
The act of receiving a blumpkin while taking an upper decker as the female is also giving two guys on the sides handjobs (the head and hand movements mimic a pterodactyl flying.)
Dude, I felt like I was in the prehistoric era because of how believable her pterodactyl was when she was givingus a blumper-decker-dactyl!