look up any word, like ratchet:
 
1.
Slang word for Police
Originates from Cockney Rhyming Slang "Bottle and Glass - Arse" Making the Police the Blue Arses.

In modern use, like the Police, Bluebottles are often found around Dead Bodies and excrement.
"Poor old Harry's dead, the Bluebottles will be swarming around his flat by now"
by CaughtJester January 21, 2013
 
2.
When you tie a piece of thin string or nylon around your penis until it turns blue.
"so Gary did your mum give you the blue bottle last night when she found out you took her car?"
by whats up bitch November 15, 2007