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1.
Roll on the deck laughing.

If you're ever on a boat, you wouldn't say "rofl" you'd say "rodl"
*2 guys on a boat*
guy 1: "what did sushi A say to sushi B?.....wasabi"
guy 2: RODL!!!
by I'm_a_pirate_on_sundays June 25, 2010
 
2.
Rolling On Dog Laughing

Sometimes seen as a mistake from ROFL (Roff-Ell), but you should know that this is the true meaning.
"RODL" that was sum funny ass biznatch.
"STFU nub, I own u on de_dust"
by Z&B&J June 28, 2003