Twirly was a word used in the tv show 'New Girl'. Twirly is a more flattering, more graceful term meaning horny.
"Today is gonna be a great day! I'm feeling extra twirly... "
" ohhh damn get some!"
The act of sitting ones anus on another individuals penis and shitting so hard the molecular motion proceeds to rotate the shitting individual in a shitting 360. Jorking it to a Kamasutra.
"Me and tyler had a dirty twirly in the janiotr closet last period!. . . You wanna wirl with the twirl!"