Low Explosive Limit. Explosive Limits The range of concentrations (% by volume in air) of a flammable gas or vapor that can result in an explosion from ignition in a confined space. Usually given as Upper and Lower Explosive Limits (see UEL and LEL).
Can also mean 'laugh even louder', to be used after lol when another joke/funnyanecdote is added.
Person 1: I stubbed my toe getting out of bed.
Person 2: lol
Person 1: Then I swore and my mum slapped the back of my head with a newspaper.
Person 2: lel
Unlike thought by many, lel does not necessarily mean the same thing as lol. It can also be used to express indifference, excitement, disappointment or unwillingness to do something. The most important part here is the intonation that is used by the speaker and the facial and/or body language that is being expressed.
guy1: bro we totally gotta start working on our geography assignment, it's due tomorrow!
guy2: lel..
guy1: breh we almost out of ganja
guy2: lel..
guy1: lel..........
guy1: LEL I just passed my exam!
guy2: lel breh please don't remind me of it.. i totally lel'd it..