thumbpacking 

The act of pushing a soft penis in to a vagina with the aid of ones thumb.

Friend 1: Did you have sex with Sarah last night?

Friend 2: I couldn't get my dick hard so I had to give Thumbpacking a go.

thumbpacking by Thumbpacksman April 20, 2017

thumbfucking my phone 

The hateful practice of text messaging.

I mean, I like the girl, but she's always got me thumbfucking my phone.

thumbfucking my phone by Jan Warren February 5, 2008