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Looking At Zombie(s) Rolling On Floor Laughing - When ROFL isn't enough.
You can expand the expression by adding LOL afterwards to make it more common, or THO (Their Heads Off (if it's multiple zombies), with the supplement AIPMPWWI (And I Peed My Pants When Watching It) if you really are going nuts.

Lazrofl that picture!!!!11!!
by Orv April 24, 2009