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Angel-wing like pattern created on sheets, furniture, or other upholstered material by sweat on the bottom partners butt during extended and/or vigorous sexual activity, especially of the cowgirl and reverse cowgirl variety.

Named for its similarity to imprinting the pattern of your moving arms and legs in snow to create a "snow angel".

Not to be confused with the sex puddle or pussy juice cocktail.
1) Get on this side tonight. I'm not sleeping in the buttsweat angel!

2) Just like a snowflake, no two buttsweat angels are exactly alike.
by jennimus prime August 21, 2009