Top definition
The residual left at the tip of the penis after a male ejaculates into a napkin or a few squares of toilet paper, most likely after masturbating.
After going on a 3 day long, masturbatory binge, and ejaculating into every napkin he could find, Jim had a big enough White Wool Cap to fully clothe a tiny, Chinese village.
by Ze Ewok June 05, 2011
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