"Lel" a term used to show appreciation of a joke/funny remark.
Lel is a spoken word but can also be typed in an Instant messenger.
Ben: Hey Ollie I have a joke!
Ollie: Tell Me, Tell Me!
Ben: Why did the chicken eat meatloaf?
Ollie: I dont know, Why?
Ben: Because he had a Boner!
Ollie: HAHAHA! LeL!