A rusty razor is the result of shaving your anus and getting shit between the blades of your razor, you then get your partner to lick the shit out of the razor and they cut their tongue! Resulting in shit and blood on the blade. If You then wank in their mouth after the rusty razor is a frosted rusty razor
My girl got a rusty razor last night.
by Yello2 October 24, 2017
Get the rusty razor mug.