When, in (or in some cases, out of) a relationship, onepartner says "I love you" when the phrase has never been used before between the two.
"How'd it go last night man?"
"Shit got awkward real fast, we sat down and ordered our drinks and I told her I loved her and wanted to have her children even though it's biologically impossible we would find a way to make it work and she said maybe we shouldn't go on another date, like what the fuck?"
"Duuuuuuuuuuude, I can't believe you just dropped the L Bomb on the first date - no wonder you're 47 and still a virgin."
A spontanious explosion of lisp at the completion of a sentance. An advanced way of speech for one with lisp, to achieve the l-bomb, the lispee must talk without a lisp for a sentance. This surplus of kenetic energy(the unused lisp) is stored thruout the sentance and released in a shockwave of lisp upon completion.