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1.
Originating in America, a Mannheim Steamroller is a sexual act that presents itself as having German roots. This act can be between a man and a woman or, in some cases, two men. The receiving partner first defecates while neglecting to wipe. After that, the man initiates anal sex, using the fresh poo as lubrication. As the grand finale approaches, the man pulls out and "rolls" his member on the upper lip region, leaving a streak of poo and semen, slightly resembling Hitler's mustache.
Man: during the holiday season, I love to give my girlfriend the gift of Mannheim Steamroller.

Friend: you mean that lame musical group?!?

Man: hell no! I mean THE Mannheim Steamroller - the single greatest sexual act in the whole wide world!
por ColfaxSteamer 20 de Dezembro de 2009
 
2.
Similar to the Stairway to Heaven, but instead of rusty trombones up and down the staircase, it is a daisy-chain of people doing Cleveland Steamers on each other. Extra points if you can work the staircase in sequence.
It was so intense last night, there was a Mannheim Steamroller up and down the staircase!
por oso31 05 de Dezembro de 2006
 
3.
noun: when someone requests a second party to roll over on their stomach. the first party proceeds to defecate on the second party's back. then the defecater takes a pizza dough roller and flattens the feces across the persons back
I got so drunk last night at this enema clinic, I woke up with shit smeared all over my back. The nurse told me I was mannheim steamrolled. I then waited and slapped her in public.
por thake jorsen 22 de Janeiro de 2005
 
4.
If, after anal sex, then man finds feces on his penis, he uses it to write on his partner's back as revenge.
"Stop rubbing your dick on my back"
touches back and feels feces
"Awwwww, did you Mannheim Steamroller me?"
por Jesus 2 01 de Janeiro de 2009