This question already has an answer here:
Kylie Jenner is showing off the new sick ride in her driveway, but the new whip is so expensive it has some fans calling for her to give that money to people in need.
Yahoo: Kylie Jenner Shows Off New $3 Million Luxury Car, Fans Upset Pointing Out People Are Starving
very informal very impressive, attractive, enjoyable, etc. This word is used mainly by young people.
The hair, make up and outfit is sick! She looks amazing!
I'm not sure if I understand it correctly. 'Sick' can also mean unpleasant. How can we determine if the speaker means good or unpleasant?