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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Anal sex, also known as 5th base.
dude she wanted me to go back to the dugout after 4th base
The small patch of hair above your ass.
John used his girlfriends back napkin to wipe himself off after sex.
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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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.