The act of grabbing the base of the cock and balls and wiping them on an inanimate object.
Jack gave the 1967 Chevelle a full frontal runtle to the dismay of the cars owner.
When you're having a conversation through text and someone makes a nice/positive comment, this is the equivalent to "music to my ears" when you're reading.
S: I promise I'll make you the most delicious bowl ;)
D: That's a massage to my frontal cortex
Frontal plumb, def; The frontal women version of a plumber’s crack.
She has her leggings so far up her ass she’s literally displaying her frontal plumb for every one to see.