Top Definition
Acronym meaning "Good Time By Myself." Commonly used when refering to the use of pornfolios or other masturbatory aids.
Jenna Jameson makes me want some GTBM. My girlfriend left me and now i can only have GTBMs.
#masturbation #porn #pornfolio #sex #rosy palm
by James Harmon January 16, 2008
5 Words related to GTBM
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