Black Mask 

A SWAT Officer

The coke business was busted when the black masks showed up.

Black Mask by Adrian_Rose October 11, 2016

Back-of-the-Mask Thinking 

When the crisp-and-crude method of calculation, which yields an approximate instead of an exact answer to a problem, is done on a mask rather than on an envelope or a napkin.

With billions of people wearing a face mask to shield themselves against the coronavirus, the back-of-the-mask thinking is a lifelong guesstimation skill math teachers and tutors worldwide ought to promote to students during this pandemic crisis.

Back-of-the-Mask Thinking by MathPlus September 20, 2020

backmasking 

A term used by people when they reverse songs and listen for secret messages.
Songs such as:
-stairway to heaven
-another one bites the dust
-my name is
-oops I did it again

and more

When you play Oops I did it again backward in a part it's going to say "sleep with me I'm not too young"

backmasking by Ultra Pulse August 14, 2005

backmask 

verb(1), noun (2).
(1) playing a record backwards, then believing that it's telling you to commit crimal acts. -forms: to backmask; backmasking.-
(2) a record that CAN be played backwords, and delivers a message, whether it be good or bad. -forms: backmask; backmasks.-

(1)
-Whatcha doin' man?
-Sheet, man, I'm backmaskin'.

(2)
-Keep that backmask flowin'!

backmask by Alise August 10, 2003

backmasking 

1. A reverse playing of a song or video
2. Often used to endorse subliminal messages

Some death metal songs tell about a venture to hell in its backmasking.

backmasking by JSizmo January 10, 2009

blackmackin 

a black man spitting game with girls who are not black. An intimidating way of getting with a female (who's not black).

Jamal is blackmackin that hot new white girl

Ludacris is blackmackin Stacy

blackmackin by AustinKyle September 30, 2009

blackmarket 

A place to sell children

I sold my newborn on the blackmarket.

blackmarket by steveharveysdaddy January 4, 2021