This word has 2 meanings:
1) From "cockradar", meaning a girl who hangs around guys,
flirting and
fawning over them, in order to get some cock. Can also be used as a
generic insult for someone.
2) Slang for a penis.
1st Meaning: "Sarah is such a radar."
"
Fuck off you radar."
2nd Meaning: "I hear Dave has
a massive radar."