When you shove your thumb in any hole to completely fill it up. A shirt can also be added to the thumb to get a betterseal. This move has been know to save lives.
A sex act where the thumb is used as a butt plug. Referenced to Youtuber Kentucky Ballistics who had to jam his own thumb into his neck to keep from bleeding out.
The girl I hooked up with last night was totally stoked for the Kentucky Plug! Said she never came so hard!