tit block 

similiar to cock block, but from a female's point of view. It usually happens when the other girl has larger boobs.

That bitch totally just tit blocked me from that hot guy at the bar.

tit block by sftbllr101877 February 4, 2010

Tit Block 

Cock blocking between girls. When your friend is getting in the middle of you and a significant other or a one night stand. Basically stopping your love life. Tit blocking is used when your friend doesn't have anyone else and doesn't want to be the only single girl in the group, or when your drunk and ready to climb into the taxi with creepy Steve from HR.-example

Why are you tit blocking me?

Tit Block by Vicky hearty February 17, 2015

tit sucking fat sun blocking lezzie 

Someone who is so fat and ugly that they need to resort to same sex relationships with other people that are irregularly hideous, not to be confused with an ordinary lesbian

Ellie is such a tit sucking fat sun blocking lezzie

tit sucking fat sun blocking lezzie by ellis walsh December 14, 2008

Titblocking 

When lesbian couples get interrupted by someone! similar to cockblocking but more fitting as its two women so hence tits. (titblocking titblocked etc)

Wynonna was titblocking Waverly and Nicole as they were kissing on their bed by opening the door and interrupting them. Waverly yelped in surprise and Nicole eye-rolled as they were close to sexy times ;)

Titblocking by LittleLeoFitz October 16, 2019

titblock 

a group of women who are showing their boobs

thats a huge titblock over there so go on

titblock by the big wiggle lolipop October 28, 2018