Ass-thumbing is when you go to the bar and drink Captain and ginger, and then you strategically place your yourself between 2 people and nonchalantly stick your thumb in someone's butt. The goal is not to get caught and to make the person getting ass-thumbed think it was someone else. Ass-thumbing also goes by " doing the Crosby" Ass- thumbing is believed to be a German tradition, and in the States, there is an ass-thumbing group in the mid coast Maine area.
by Aaron goodwin July 6, 2014
to use one's thumb or finger in an attempt to prop up one's soft, flacid, floppy penis during intercourse
by macfear August 23, 2014
Related Words
thumbering
• thumbring
• Thumpering
• Tumbering
• thumbing
• Tumblring
• thumbing it
• Thunberging
• Thumbelina
• Thumbling
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by PanzyWarfare October 17, 2009
I was tumblring so hard last night I forgot to sleep but it's okay because I dipdyed my hair and got an american flag tank and combat boots, I'm a hipster now!
by wannabehipstah January 20, 2011
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by sweet650 March 19, 2009
What cool people do.
by Yoooooooooooooooooooo. September 26, 2010
Get the Tumblring. mug.Friend:Hey Brian is your thundering cunt coming to Christmas dinner?
Brian:No Amber's parents are going away for Christmas
Brian:No Amber's parents are going away for Christmas
by Fuckyourcuntmom August 24, 2016
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