An arm like a bee's wing

Having an arm like a bee's wing is a euphemism for a man masturbating furiously, his arm moving so fast it becomes a semi-transparent blur

The Great Masturbator: Aw man I was watching Married With Children last night and Kelly Bundy was looking so hot I had an arm like a bee's wing!!!
Masturbator's Sidekick: Awesome! Have you managed to reach buzzing frequency yet?
The Great Masturbator: Jesus, if it was possible I think I'd have done it! Hell I might even take off one of these days!!