When your
lady friends vaginal juices are so thick and greasy that they leave a
hard coating on your erect pecker, this creates "The
Twat Sickle". This is usually an undesirable ailment, so to be called one is rather rude.
(Dave) "Man, after banging Susie last night I woke up with a huge
Twat Sickle!
(
Joe) "You better get that thing on
ice!"