Back Napkin

The small patch of hair above your ass.

John used his girlfriends back napkin to wipe himself off after sex.

back heavy

To have a big butt

That girl is very back heavy

tow back

Fucked up, no good, broken

That shits tow back bro

fall back on

to depend on something after a loss or failure

The family has no savings to fall back on. I fell back on skills I had learned years ago when I had to earn a living for myself.

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Back to the dugout

Anal sex, also known as 5th base.

dude she wanted me to go back to the dugout after 4th base

barnacle back

The state of a persons back; when they do not wash their back during a shower, the accumulation of dirt and dry skin which literally looks like barnacles.

"Look at that chick in the tube top,she has a barnacle back!"

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Skanker's back

A condition suffered by ravers the day after a night full of dancing; a sore back (and jaw, probably).

Dude: You sat down like a right old twonk then, whatsup?
Other Dude: Skanker's back mate, went Hospitality last night.