It means look after yourself.
"Pas" in Afrikaans can have a few meanings, such as "fit" or "suit" in English. It can also mean "to happen" or "to occur" depending on the context.
Mooi bly or pas jouself op
"Pas bon" = "Not good"
"pas sale" means "not dirty"
"Pas pire" means "not worse".
Touche pas --> Do not touch
"n'est pas" means "is not" in English.
tu n'es pas gentil, pas gentille
You can say "Je n'ai pas" in French to mean "I don't have."
pas trés bien - not very well
N'est-ce pas means "isn't it" in English.