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It"s usually used when you're talking about your best friend meaning he/she holds you together and keeps you in check. Also could mean you two belong together.
she is my lock and key, i don't know what i'd do without her.
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by bathtub queen April 04, 2017
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The act of performing anal sex on a woman and being able to tell anyone in a very clean and discreet manner. It is also a way for a woman to show her man that she is willing to go above and beyond the call of duty to please him.
"Hey bro....i got the Lock and Key from my girl last night."

"Baby, when are you going to let me get that Lock and Key?"

As I approached the bedroom, little did i know that she had the lock and key waiting for me.
by daddyof2lilshiz August 08, 2011
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