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 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

back channel

Using a common friend as a secondary way to communicate to your girlfriend/boyfriend the things that are uncomfortable for you discuss directly with your girlfriend/boyfriend.

"Hey Steph! You're my back channel! What does Lisa like as far as engagement rings go?"

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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