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3.
While in the act of receiving a blow job, the man sharts in the females face. Spray poo might be involved
Example: "I was totally getting some head and I gave this chick a rusty monkey... Sharted right in her face"
by oops I pooped February 25, 2010
 
1.
An aged but well maintained car, generally from the 1980s, that has been bought cheaply and lovingly restored to its former glory. Rusty Monkeys are typically bought cheaply (for less than £500) and restored to take part in charitable events, races, meetings or just for the fun of it.
Typical and popular Rusty Monkeys include the Audi Quattro, the old-style Ford Escort, the Ford Scorpio, the Trans Am and the original police Panda cars like the Ford Anglia.
by bravebrian November 18, 2010
 
2.
Drinking down a forty ounce alcoholic beverage to a desired level (typically the bottom of the cone), then topping off your forty with Mad Dog 20/20. The same concept as a brass monkey, but a lot more disgusting.
Jose: That beezy was on my dick last night!

Juan: Well no wonder, she had herself a rusty monkey
by grady hernandez October 13, 2012