Thumbkin
Performing the act of splinting on a consensual female partner, while performing oral sex on her. This involves inserting your thumb into her vagina, pushing down towards the anus to help her relieve constipation, while sucking on her clit.
"My lady was horny as hell, but also constipated so I offered to give her a thumbkin. The simultaneous orgasm and poop drove her absolutely wild with pleasure!"

"I bet it did! You're an inspiration to us all my friend."