A Darcy
A Darcy is when you use your thumb to tickle someone into a sexual frenzy. It’s like the best kind of torture, but also the best kind of fun.
He used his thumb on me and I couldn’t stop laughing. Or screaming. Or both.
She tickled me with a thumb and I got a hard-on. It was unfair.
I did a Darcy on my crush and now we’re both in trouble.