In the U.S. it is usually used when something is cool and exciting.
In the UK it is used more to describe something not so pleasant, if something is gruesome and disgusting then it's sick.
The act of vomiting, feeling ill.
2 girls 1 cup is sick!
I felt sick yesterday.
2. Awful. “I have a sick amount of homework, and I’m still procrastinating.”
3. Incredible; amazing. “He’s got a sick Benz, yo.”
'I haven't seen Royston in so long it sickens me'
'Fred is grotesque the way he walks is sickening'
B: I know, it's DISGUSTING!
A: You know what's funny? When you combine their names you get SICK!
B: lol. Just like the actual couple!