Blumperdecker 

Receiving a Blumpkin while taking an Upper-Decker, it's as simple as that.

Joanie loves Chachi so much that she gave him a Blumperdecker the other day in a rundown truck stop bathroom because they had nothing better to do.

Blumperdecker by Dico Brohey February 22, 2010

blumperdecker 

The act of receiving a blumpkin while taking a shit in the back part of the toilet or otherwise known as an upper decker. For the desired effect you must ejaculate into the toilet bowl and leave unflushed semen in the toilet. Someone will see the semen and procede to flush it unaware that the toilet bowl will now be filled with shit. Its a perfect mash-up of the blumpkin and upper decker

My roomates wouldnt stop leaving the toilet unflushed full of piss so I left them a very surpising blumperdecker

blumperdecker by mypimppony May 4, 2015

Double Blumperdecker 

When one person shits in the water tank, preferably onto the ballcock, while receiving oral sex from a partner who is sitting on the toilet, AC Slater style, also taking a shit.

So I went to leave an Upper Decker in Bill's toilet, but Mary came in and offered to give me a Double Blumperdecker since she had to shit, too.

Double Blumperdecker by Tarzanello April 1, 2015

Blumper-Decker-Dactyl 

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 giving us a blumper-decker-dactyl!

Blumper-Decker-Dactyl by CPSC October 4, 2010

Blumper Decker

Getting a blowjob while performing an upper decker

Did you here about slut last night giving him a blumper decker?

Blumper Decker by Stevie Thunder April 25, 2009

Blumper Decker

The combination of a blumpkin and an upper decker.
To defecate in the tank of one's toilet while receiving a blowjob.
i.e. To get mad domepiece while releasing the beast into the top of that Faggoty Ann's toilet.

Leopold: My asshole roommate fucked my mom last week, so I asked his mom to come over to 'see which of his clothes not to donate'. I broke out a decadent white zinf at the end, and one thing led to another... Next thing I know I'm getting him back with a blumper decker in his bathroom with his mom.

Lance: My stars, good play.

Blumper Decker by Wlllford Brimley September 1, 2010

Blumper Decker

A variation of the Blumpkin; getting a blowjob while giving an Upper Decker.

Yo man, I met this girl at this doucher's house and took her in the bathroom and got into an amazing Blumper Decker. That girl gives a great hummer and that doucher's bathroom is gonna smell like shit for weeks!

Blumper Decker by E-Nasty February 26, 2010