Finger bum flank
The act of kissing ones partner standing face on and flanking a sneaky finger into the anus to cause surprise
Michael was under the impression dale just wanted a kiss. Little did he know Reza was setting him up, face on for a finger bum flank
finger flank
when you slip your finger in your girls butt hole at the movies.
"I finger flanked my girls at the movies my dude"