When you ejaculate into a tub of hair gel/moose/wax and proceed to slick you or a friends hair back.
I once gave myself a sloppy slick-back.
Depending on where you are in the Eiffel tower, you are either the front cop or the back cop. The front cop is responsible for the mouth, nose, and ears. The back cop is responsible for the anus, vagina, and other orifices.
Michael: Hey P-Ka$h, do you think you'd be down for some good old Front Cop, Back Cop action downtown tonight?
P-Ka$h: That's really sus Michael, but if I get to be the back cop, you got a deal!
Michael: Nice P-Ka$h! Love having a good time with you!
When a female puts her phone on her back pocket making you wanna look at what she's got.
That Back-Pocket Bitch had a Samsung S8!
When you put your drugs directly into the back of a syringe instead of filtering them.
No time to filter this meth, I'm just gonna back-load it.
When a song plays back in your head over and over.
When one has recurrent flashbacks of a track.
When one refuses to stop singing on repeat only a small portion or snippet of song.
Listening to top 40 often causes track backs for listeners, who on occasion get a song stuck in their head.
Apart from the original Richard Keys usage of the phrase, to hang out the back of something can be used as an expression of approval of something well done.
(after eating a good meal cooked by a friend) "that pasta was great, you really hang out the back of it"
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A phrase used to signify that the subject has little to no support on their opinion
Jimmy: I think that we should all get more homework
John: All your mates are backing you up, trust me!
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