An extremely large penis, the penis equivalent of XXXL.
Girl: Can I see your cock?
Boy: Sure
Girl: You have a 2 meter beater!
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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