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.
Todd : Yo dude you hang out at the party?
lispet: yeah man we got wasted and pissed on that bitch's couch...... lesheshkba