The thing with is simultaneously keeping you alive and killing you, often used to describe a person who you're in love with, but, may be bad for you.

or

Room 505 is a metaphor for a place where everything was fine in their relationship, and the person in the relationship wants to go back there because now its killing them that everything is falling apart.
'I'm going back to 505, if its a seven hour flight or a forty-five minute drive. In my imagination you're waiting lying on your side,

-Alex Turner, of Artic Monkeys
by peaćhykeen April 30, 2019
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Pronounced Five-Oh-Five. The thing which is simultaneously keeping you alive and killing you, often used to describe a person who you're in love with (but who may be bad for you).
I knew he was bad for me but I kept coming back... I needed him. He was my 505.
by dreamdreamdream May 06, 2015
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505 is the best song to exist on earth and no one can top it, it’s just that great. You might find yourself replaying it for hours and hours and it’ll never get old.
my favorite song is 505.”

“really? me too!”
by eliza6eth May 05, 2021
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505 means having a good mood,happy energy
I’m on 505 today because she loves me
I’m so fun when I’m on 505
by Bentil cobby Essuman December 28, 2020
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a person who is very important to and who you consider the most important thing in the world even but maybe it’s bad for you.
He/she is my 505
by slywavts January 04, 2021
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Meeting up with buddies right after work for drinks, usually down at the local bar.
hey, it's friday, lets do a 505 today
by flyingtattoolady October 25, 2006
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