noun. A propulsive force known in some dialects as doodoo-mentum.
Real citation: "The Mariners have a tenuous half game lead in the race for worst. While an amazingly dull 8-game losing streak has given them a ton of crap-mentum, 6 of their last 10 games are against the A's. That's going to make it extra challenging to finish the season weak."
(Sept. 19, 2008, Mariner Central, http://www.marinercentral.com/forum/lofiversion/index.php?t1272.html)
Made-up citation: "Scientists studying the causes and effects of crap-mentum have come to some startling conclusions: Crapitudinousness is more common than salt, and the only crapfest-free thing in the known universe is the tuna steak at the Bad Dog Tavern in Chicago."