swan margarine

The female equivalent of duck butter. i.e. When the sweat from the butt and the vagina meet in the girlie-taint and form a spreadable buttery substance.

EEWWW! That bitch had so much swan margarine she could butter both halves of the bagel.

It is so good it will have you saying, "I can't believe its not duck butter!"

swan margarine by butterbeard March 16, 2009

swan margerine 

An upscale form of duck butter, said to
contain fewer calories than than the
original smegma-based spread. Delightful on rye bread!

The ambassador dined on quail eggs and
imported crackers smeared heavily with
fragrant swan margerine.

swan margerine by Kleetus Kirklen, esq. August 14, 2004