crack the bed
When you need to sleep so much that you can't do anything else except throwing your self heavily into your bed
Mate, I'm feeling knackered I can't be arse to go out tonight, I'm gonna crack the bed instead
ass crack of the bed
the space between the wall and the bed that you get stuck in when you roll over too far
"OMG you guys, last night you shoved me into the ass crack of the bed."
"Eff you broke the outlet."
"Eff you broke the outlet."