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Marked For Later. Used on Internet forums to mark a topic of interest to the user that he/she may not be able to view at the current moment (i.e., the user is at work and the topic contains a link that isn't safe for work).

By marking the topic with a post, the user can go back later and, usually by using a "My Latest Posts" feature, view the content.
Topic: Nekkid JAlba Pics

Poster 1: *fap* *fap* *fap*
Poster 2: At work... mfl
by Filthy Sally September 10, 2007
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Massive Fucking Laugh, otherwise abbreviated, MFL.

1. A direct replacement for LOL.
2. Generally used by those, who for whatever reason, do not want to use LOL.
Dude, that comedy vid made me MFL!
by laxr5rs July 12, 2012
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Mormon For Life. Usually used by a Mormon after they have refused to do something that goes against their religion or have decided to "Choose the Right."
Cale: "Hey Thomas wanna beer?"
Thomas: "No bro, MFL"

Richard: "Hey Bennet, you coming to the Football game?"
Bennet: "No I can't. I'm going on a temple trip. MFL."

Rodrigo: "Hey would you wreck her if you got the chance?"
Joel: "Yeah of course! After we got married in the temple obviously. MFL."
by JG-Q July 14, 2013
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Mother Fucking Loser.

Similar to Mother Fucking Liar, except this applies to a hella lot more people.
I just heard from Carl last night. He says his marriage last year was "a big OOPsie" and wants to get back together. OMG, what a MFL!!
by scruzdoll August 01, 2010
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Much Family Love, used by juggalos and lettes

Closely related to MCL
Cya lata juggalos n lettes, MFL
by Aly October 07, 2004
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