Lel is a spoken word but can also be typed in an Instant messenger.
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!
Etymology: lol, with the o replaced by an e. The reason is phonetic: lel, when pronounced, seems a bit more sarcastic.
A: I + 2 = 3, and H - 2 = 5, (random bs that lasts for 2 pages) thus I + H = 2
B: lel, took me a while to realize you were trolling.