When you can see an erection through someones pants. Normally occurs during foreplay or while making out. Sometimes it occurs when a male thinks about a women in an erotic way.
Ex. A Girl turns to her boyfriend/husband after some foreplay and she asks "Do we have WormSign." and his reply is "We have WormSign the likes god has never seen."
by AlkalineProdigy March 29, 2009
1 more definition
From the book series Dune. It's a sign that a large sandworm is approaching. Can be used in any situation where one is asking if something is approaching.
Stilgar, do we have wormsign?
by DrHogie July 22, 2008