What is Licking The Seam?
1.
When one naked male lies flat on his back, with his legs folded against his chest so that his feet are situated behind his head, and has his partner lick the seam that runs down the centerline between his anus and testicular region.
"Christian was licking the seam of Raj up and down to the beat of Toxic by Britney Spears last night, while Cristian masturbated in the corner."
See