Thumb Blast
The act of using one's thumb or thumbs to infiltrate one's anal or vaginal opening using extreme force and excessive repetitions. Similar to finger blast.
Yo bro, I thumb blasted the shit out of that girl from the bar last night.
thumb blasted
When your fucking your girl in missionary and she opens her mouth to moan and you jam your thumb down her throat until she vomits.
Sam thumb blasted his girlfriend last night.