To butt-fuck multiple times, ie plural.
Aww that was some damn fine boofage (spunks up her ass)...
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1) The act of boofing.
2) To smear hot sauce on ones nutsack and shove the nutsack into another's rectum while sucking a giant cock.
Jimmy: " I just had sex! "
Timmy: " did you and shelia boof?"
Jimmy: " yeah i did some hardcore boofage in there!"