Top Definition
When you are doing your partner from behind, usually doggie style, and you "drop" your thumb in and out of your partners a-hole.
I was doing my girlfriend doggie style the other night and I gave her the ole Thumb Drop!!
#thumb drop #butt plug #plugging the a-hole #dipping the thumb #thomb frop.
by usernamemyazz January 10, 2014
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