A term used when someone, usually male, is more pissed off than usual - if something crawled up your leg and bit your bollock you would quite understandably be pissed off.
Usually quite a subtle way to tell them they're acting annoyed, funny too.
Joe: " STFU DUDE!"
Jim: "Damn, what's crawled up your leg and bit your bollock ?"
When a male hits puberty; the balls become saggy when puberty comes, thus they 'drop'
Yo! Did you hear Joe's voice? I guess his balls dropped...
Or
12 Year old squeaker : Hey guys wanna go play some Minecraft on Xbox?
13 Year old Non Squeaker: Shut up dude! Your balls haven't even dropped.
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