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n. the act of sticking ones' penis backwards through ones' legs while reaching behind ones' thighs to grab the shaft of the penis and masturbate furiously with an end goal of profusely spanking ones' balls like a boxer hitting a speedbag.

v. to commit the act of reverse speedbagging.
"Oh man, Eva was so hot that Chris told me he went home, busted out the croc butter and reverse speedbagged all night."
by Chris Awwsteen January 28, 2008
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