A very noticeable bulge beneath a tight clothed males waist line, more popularly known as a hard on or erection. Due to the restricted room for the dicks extension, it fails to fully protrude outward, thus, remaining hindered and resembling an intriguing mound-shaped growth instead. Women have camel toes and men have moose knuckles (which is actually pertaining to the knee on a moose).
"Oh my GODgirlfriend, did you see the size of that moose knuckle that guy was carrying around under his speedo?"
The male version of "camel toe". Where said male's pants are so tight and/or transparent, the shape/details of their anatomy are clearly visible even through the garment, resembling the appearance of a moose's lower ankle (or "knuckle").
"When I watched wrestlinglast night, that tag team had on spandex shorts SO tight, they were sporting some SERIOUS moose knuckle!!!"
Can be used in two ways:
1)To refer to an obese woman's camel toe.
2)To refer to a man who is splitting his package in two with the seam of his overly tight pants.