What is Ymas?
1.
You're making a 
Rich girl with friend in front of poor girl
Rich girl to friend (loudly): Isn't my shirt so expensive?
Poor girl: YMAS >.>
See 
2.
A popular abbreviation for You Me At Six. A British Power-Pop band.
YMAS fan 1: Hey, going to the YMAS concert tomorrow?
YMAS fan 2: Of course, they rock! I love Josh's accent.
See 
Random Words:
1. 
To be sick: possibly is a violent or projectile way and maybe even producing a wide range of colours and textures.
See also chunder
Me..