Slagging is a term used to describe a kind of harsher form of teasing. While this may seem like an insult to some, to the Irish, it's
considered a behavior that shows
affection or bonding, and, in some cases, is even used as a
compliment.
John:*falls down*
Patrick: Jesus, were you born with one leg shorter then the other?
John:
Fuck off
Patrick: Calm down, I’m only Slagging you