conk 1 
(kŏngk) Slang
(kŏngk) Slang n.
1.
a. The head.
b. A blow, especially on the head.
2. Chiefly British The human nose.
v. conked, conk·ing, conks
v.tr.
To hit, especially on the head.
v.intr.
1. To stop functioning; fail: The engine conked out on the final lap.
2. To fall asleep, especially suddenly or heavily: conked out on the couch watching television.
3. To pass out; faint.
4. To die.
[Perhaps variant of CONCH. N., sense 1b, and v., probably of imitative origin.]