Top Definition
Whilst having intercourse from behind (usually doggy style) the act of inserting a thumb in your partners rectum, then proceding to take it out and suck on it.
Cody : I was fuckin this chick hard doggy last night and I had the best arizona thumbsicle of my life

Taylor: You're a sick fuck. But I dig it!
by Up and in April 21, 2009
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