What is Nightstick?
1.
cop cock,police penis, aka dick
Dialogue
Person#1 Yo I got drunk at this party, and stumbled into a cop
Person#2 Did you touch his nightstick?
See
2.
In gay lingo, a large black cock.
Tyrone's nightstick was so long you could see the outline of it in his jeans down to his kneecap.