" air brake "

 [ "air brakes" ]

1: sound, a PSSHHH, type of sound that is similar to a trucks air brakes. The meaning can be two fold, 1st this sound is performed when you are in strong disagrement with a person or with something they might have said. and the 2nd would be performed to say "fuck you" to someone without them really knowing. If they knew you were telling them "fuck you" they would donkey punch you in the head

  * e.g.,  ... girlfriend: tom ! all you want to do is drink beer with your friends,or fuck and watch porn. i can't stand it anymore ! ! 

 [ "Tennessee air brakes" ]

1: (Traditional) Large, floppy, low-hanging mudflaps on a semi/large truck that create a lot of wind resistance, on the irrational premise that they slow the truck down along with the standard air brakes on large trucks. Tennessee reference due to the majority of truckers being some degree of white male with a propensity for camouflage clothing and stickers like “USA Love It or Leave It.” (Modern) Large, floppy, low-hanging pussy lips that might otherwise be referred to as ‘mudflaps’.

  * e.g.,  ... Wow, that semi’s mudflaps are big and flapping like crazy. Yep... them’s some Tennessee air brakes raught there. Dude... did you see Jolene from high school is dancing at the new strip club?