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To spunk in ones trunk is simply another way off explaining ejaculation from a mans penis in the anus after climaxing during anal sex. The 'spunk' left in the anal canal after the anal sex has taken place is now classed as spunk in the trunk. A man wanting anal sex with a lady (or man) may say 'I would like to spunk in your trunk'
When a male reaches climax during anal sex and ejaculates. with either a woman or another man, this is deemed a Spunk in trunk moment
by lotsofloprabbits December 07, 2013
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