don't piss down my back and tell me it's raining

something you say when someone lies to you, cheats on you, betrays you

john: i love you anna.
anna: don't piss down my back and tell me it's raining!

Down in the back

Referring to anal sex

He’s really into going down in the back
They really like it down in the back

The down-and-back

When someone giving a blowjob in 69 position slides down into the reverse cowgirl.

The 69 was amazing enough, then she did the down-and-back and it basically blew my mind.

Down-Back-Up

The most advance and effective form of ball-tapping.

A move executed from behind, it involves grabbing the balls from between someone's legs, and pulling them "Down, back and then up." The victim should fall forward due to the nature of the attack.

Being a sneak attack, It is extremely effective and easier to pull off than the common ball-tap.

Variations include just a simple "Back and up" move, exactly the same but without the first Down pull. The victim should be lifted into the air before falling forward; this is very humiliating.

Lyman: So I was standing there minding my own business, when that jerk Matt came behind and Down-Back-Up'd me.
Ryan: Ouch man, slap dat ho

Maybe one day we can all go down-back-upping in the woods!