When a woman is giving a blowjob, and applying a great deal of suction, the expression of her face, especially her mouth, makes on the upstroke is called fish lips.
Here is a photo for you of your wife making fish lips on my dick while you were on your business trip.
by Nebul April 26, 2013
Get the fish lipsmug. by Downzy December 17, 2007
Get the fish lipsmug. by Carmen Warder June 21, 2017
Get the Fish Lipsmug. 
A common physical disorder present in adult women in which a she has a foul odor emanating from her vagina. This odor strongly resembles the odor prevalent in local meat markets and fisheries but amplified to an even more uncomfortable level. Fish lips may also be referred to as fish pussy, fishermans delight or the Krystal special.
Damn man, Krystal sure has a bad case of fish lips. I bent over to tie my shoes and that cloud bitch slapped me in the face! I dont know if it was the liquor or what but i threw up immediately.
by Steven. December 4, 2016
Get the Fish Lipsmug. by EmilyHxcSonn July 10, 2009
Get the fish lipsmug. noun-a phrase from Scrubs usually meaning that he/she is a bad kisser and they would never kiss them.
by CsWs Yates916 October 8, 2008
Get the fish lip bittymug.