When you cum in a girls vagina and she queefs so all of the cum starts bubbling in her vagina.
Noah finally cumed in Haylee and she started to have a Utah Hotspring
C: Cringey
R: Retarded
U: Useless
S: Stupid
T: Trash
Crust is an acronym used to insult people and or what they say.
Trey- Dude Jacob you are so CRUST