flacc' 

pronounced like glass with an f. Short for flaccid. Means not cool.

hey bro that was pretty flacc'

flacc' by flaccman November 3, 2018

Flacc 

When she a little flat but call her thicc

That girl over there is flacc

Flacc by Coreyy Webster October 9, 2019

Flacc 

To be flacc't is to be slammed against the vaginal wall with a soft cock repeatedly. Derived from the word flaccid

Also relevant when some dimwit can't find the right hole.

Stop flaccing me, harden the fuck up or get off!

Wrong hole, flaccer.

Flacc by Flaccid and passive January 6, 2012

Flacc-off 

To experience an explosive discharge of arousal that occurs when watching Baltimore Ravens quarterback Joe Flacco effortlessly throw a perfect spiral 40-yard pass to Derrick Mason or Mark Clayton.

what a pass! excuse me while I go into my room and Flacc-off

Flacc-off by alexeipgil February 6, 2009

Flacc Out 

To back out of something at the last minute. Similar to "pussy out." Derived from the word "flaccid," and pronounced "flass out." When one flacces out, his flaccing out is compared to his penis going soft right before a critical juncture in a sexual encounter.

Aaron: Hey bro I don't think I can come rage tonight, I'm feeling sick.
Bro: Aw come on man don't flacc out on me.

Chad: Hey dude why wasn't Aaron there last night?
Dude: Bro told me he flacced out at the last minute.
Chad: What a flacchole.

Flacc Out by FightOn&FlaccOut June 3, 2013

Flaco

It means skinny or thin male.

Utilized in a good sence not in a mocking way, but as a nickname to a friend, relative, or boyfriend.

Mom- Where my handsome "flaco"?

Flaco by FritosConQueso August 12, 2016

Flac Attack 

Mountain Dew throwback mixed with pomegranate vodka. An amazing drink named after Ravens Quarterback Joe Flacco.

Tom: Hey, what should we drink tonight?
Hayley: Ravens won...let's have a Flac Attack to celebrate!

Flac Attack by flacattack October 27, 2011