Dual usage term. The first, essentially benign; when the individual's crack and grundle is perpetually damp due to exertion in a warm setting. Example: Push-mowing the yard on a 95 degree day. Secondly, when the individual, despite his best efforts, cannot maintain a satisfactory level of cleanliness in the "nether region". This phenomena is from an incremental excretion of residual stool, or a particularly moist bout of flatus.
I am hung like a motherfuck this morning. Whiskey and chili don't mix in excess. I have Damp-Ass Syndrome going on in the worst way. I've been to the can 3 times today just to wipe! I'll never get the smell out of this chair.