Beast with two Backaches 

Old people sex!

When we do make the beast with two backaches, our onomatopoeia is less "ooh" and "ahh" than "crack" and "help".
Credit Chris Onstad

Beast with two Backaches by OP8 Massive February 18, 2009

Backachingas 

A females mammary glands (boobs/ tits)

DDAAMM!! Look at her backachingas!!

Backachingas by B0$$ of the B0$$'$ August 25, 2009

backacne 

A fairly common dermatological condition consisting of a rash or an outbreak of acne on ones backside. Not limited to the back, but anywhere that is not considered someone's "front".

Even those who've never suffered from backacne should immediately understand what it is from it's use in context.

Two syllables, and is often mis-heard in advertisements for arthritis nostrums: "...to cure back, knee, hip, and joint pain."

"Hey, could you put some of this Persa-Gel on my back? I've got an outbreak of backacne and I can't reach it."

Flavor Flav had backacne,
just ask James Cagney,
he beat up on a guy
when they found he was a fag-ny.
(sung to "Letter To The New York Post" by 'Public Enemy')

backacne by Nullmuse73 January 16, 2009

Backcheek 

The fat of your back that cannot be differentiated from your ass.

"Hey Chad, those backcheeks are pretty sexy!"

Backcheek by Fotojennic March 4, 2018

Blackacheican 

(Black-a-ch-e-can) A Black Chinese Puerto Rican

Black Girl: Yo you want to fuck?
Chinese Guy: Yea Sure
20 years later
Blackinese Guy: Yo you want to fuck?
Puerto Rican chick: yea sure
20 years later you have a Blackacheican

Blackacheican by Jake Fiedler July 21, 2009