League of Legends (LoL) Question: peel comps

It means a team composition that focuses on protecting its backliners and kiting away from opponents. If you have strong ranged carries, it can be more beneficial to protect them rather than trying to kill the enemy carries.

Peeling is basically just another word for defending your more vulnerable teammates. A good example would be a team with Kog'Maw that uses champions like Lulu, Janna or Ivern to protect him while he kills the enemy team.