colon wrecker
A penis that has the ability to go so far inside of a female in sexual intercourse, that it makes the females colon or other internal organs slightly ache, itch, or bleed (maybe bleed if it's a 2 meter beater)
Megan: I hooked up with a guy last night, and he had a colon wrecker.
Julie: No way! How do you feel?
Megan: It was great, but my colon feels a little achy
Julie: No way! How do you feel?
Megan: It was great, but my colon feels a little achy