What's an All-Out-Attacker

So I was looking at sets for togekiss in dpp on the smogon dex and I found this one set which was named "All-Out-Attacker" I only know about a few roles pokemon can take in competitive so if someone could quench my curiosity I would be grateful.

So I was looking at sets for togekiss in dpp on the smogon dex and I found this one set which was named "All-Out-Attacker" I only know about a few roles pokemon can take in competitive so if someone could quench my curiosity I would be grateful.