LBL = little bladder leakage. when on social networking sites and you didn't just LOL because it was funny

A pubic hair piece. A toupee for the pubic area/genitals. In the 1700’s when mercury was used to treat sexually transmitted diseases (Gonorrhea or Syphilis) one of the side effects was the loss of pubic hair. To disguise this condition, that was not cured by mercury, a Merkin was employed.

"loud black laugh." This laugh is the equivalent of a large black woman laughing.
Sounded out, it would be hah-HHHAAAHAAA (2 syllables total), like a larger "country" black woman would say.

LBL; Laid Back Larry
Someone who doesn't give a fuck and does whatever they want.

=long, boring lecture

the Logic Behind the LOL or LBLOL or just LBL.
The understanding of a private joke between friends that may be innapropriate around the company present when the joke is told.
The Joke is sometimes only funny from the tellers point of view...or though those who dare not laugh will sometimes just confer by saying they understand the LBL or logic behind the lol.
If youre friend makes a private joke with you in the presence of those oblivious to the joke being made, it can sometimes be innapropriate to laugh for fear of inadequate social judgement...therefore it is sometimes customary to just notify the teller of the joke that you got the LBL in a very sly way.