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".
"n'est pas" means "is not" in English.
Touche pas --> Do not touch
tu n'es pas gentil, pas gentille
N'est-ce pas means "isn't it" in English.
pas trés bien - not very well
n'est-ce pas means isn't it in French.