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Slang; from lesbians in the military who have competitions to see who can last longest, the word comes from the sound made by several ladies masturbating at the same time.
The sound of the cadets thrapping in their bunks could be heard across the base.
by Auric the Rad November 17, 2003
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"Thrapping" Adj. : Rapping (a form of ethnic poetry with an instrumental backing or Acapella) done by one who resembles a thumb.
Wow Man! Check out Liza's "Thrapping" it's off the chart!
by Thrapper561 September 30, 2017
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