Thumb sex 

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

Thumb sex by Definedgirl4756 April 8, 2010

thumb sex 

when she grabs your hand and treats your thumb like yo dick and you high key bust a nut

bæ-*grabs thumb and jerks it off, initiates thumb sex
bruh- *blows a load to fucking mars

thumb sex by roastinsnakesandfuckinrakes April 19, 2017

thumbsex 

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.

thumbsex by slovaksensation June 30, 2008