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1.
From the sitcom Friends.
Phoebe talking complete nonsense, exclaiming that Rachel is Ross' lobster and their suppose to grow old together.
nicole trying to use the 'she's your lobster line on me'
nicole: you're my lobster
me: WTF?
nicole: you know, off friends?
me: uhh no...
nicole: =/
me: owned!
by i'm licking your windows November 03, 2008
 
2.
She's the love of your life.

As told my Phoebe Buffay on the TV show, Friends.
PHOEBE: Hang in there, it's gonna happen.

ROSS: Wha, OK, now how do you know that?

PHOEBE: Because she's your lobster.

CHANDLER: Oh, she's goin' somewhere.

PHOEBE: C'mon you guys. It's a known fact that lobsters fall in love and mate for life. You know what, you can actually see old lobster couples walkin' around their tank, ya know, holding claws like...
by banananna89 September 17, 2013
 
3.
lobster's mate for life. If someone is your lobster they are your mate for life.
She's your lobster, he's your lobster, we are each other's lobster
lobster mates life partners partners
by sfdahliagirl November 15, 2013