The method where two individuals decide to have sexual relations in a trunk of a vechicle in which to conceive a child.
by BigNorthernCountryBoy1 August 14, 2016
Get the Trunk babymug. My ex girlfriend Locked me in the trunk because I wouldn't get her pregnant. So I unloaded a fat "Greasy Trunk Baby" all over her stripper clothes so the tank would be empty next time she tried.
by MADAZZMATT October 29, 2019
Get the Greasy trunk babymug.