Top Definition
When two people hold hands and run their thumbs around the other persons thumb or twiddle the thumbs.
"omg! Guess wat me and Anton did last night," said Cici
" you mean..." said ary
" we had thumb sex.. In the movies!!!" cici exlaimed?
" did he use a glove?" asked ary
door Definedgirl4756 7 april 2010
1 more definition
The act of using the text message feature of a cellular telephone to vividly act out sexual acts. Similar to cybersex, but pertains exclusively to the use of text messaging - does not include instant messaging or the use of a webcam.
I had thumbsex with my girlfriend in class today, and the girl sitting next to me saw my boner.
door slovaksensation 10 juli 2008

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