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1.
"TL/FWI" is a phrase that spread across the internet fairly quickly in early 2006 via Internet bulletin board systems (BBS). The defintion of the five letter acronym is widely debated and rarely agreed on. In fact, the context of it usage widely varies from board to board, or even within the boards themselves.

Known Usages:

-insult for a long post
-compliment for an humorous post
-acknowledgement of a strangeness or weirdness of a post
-irrelevant response to an uninteresting topic
-can be added to a post to imply raunchyness or cheekiness

The origins of the phrase is believed to the forums of the Sherdog BBS, more specifically the Off Topic forum, which has spawned the TL/FWI group (AKA The TL/FWIlluminati) in the Spring of 2006.

The group claims to promote for general random humor and moments they define as "WTF?" moments. They browse boards across the internet conversing, creating, and pointing out these poignant moments with their group slogan "TL/FWI".

The actually meaning of the phrase "TL/FWI" is supposed to be a closely guarded secret, known only by the higher level members of this group. They've adopted the surname "Illuminati" to reflect this element of secrecy.

Also popular amongst the group are disturbing images, various pornography, and Danny Glover.
"Yo man, I was checking up on OT, and all the sudden I find Tranny pics on the board."

"That's def. TL/FWI"
by TapOutGrapler May 18, 2006
 
2.
Too Long Fwapping Instead

An insult for a post that's too long. Used as a replacement for tl/dr (too long didn't read)
Random Guy: blah blah blah

Random guy 2: tl/fwi
by anonymous bitch September 11, 2006
 
3.
A phrase used on internet boards to signifying:
-an insult for a long post
-a compliment for an humorous post
-acknowledgement of a strangeness or weirdness of a post
-an irrelevant response to an uninteresting topic
-raunchyness or cheekiness
"that tranny photo was so tl/fwi worthy" or simply "tl/fwi"
by Chunk Monster May 18, 2006