Having sex without the proper lubrication, causing the woman complain.
This is a metaphor to the sound made by high performancemotorcycles that have a dry clutch system, which makes a humming, annoying sound when frequently applied.
A phrase used to portray the angstresulting from street cocaine use. Can also be used to describe the actual act of insufflating street cocaine. It represents the anxious feeling of having the compulsion to clutch your sheets in bed unable to sleep or relax.
As a verb: Guys, I'm not going to the birthday party; I'm sheet clutching tonight.