sibnificant other 

When your significant other looks like they could be your sibling.

BUDDY: Did you see Pat's sibnificant other?

BRO: Yea, dude, name's Kelly, and I know what you mean. I agree 100%.

BUDDY: Maybe they should have a heart to heart with their parents, or get some DNA testing.

BRO: Really, that's some freaky shit. I'm not sure that that's just a coincidence, I mean, they just look way too much alike!

sibnificant other by Gene Splicer June 11, 2006

significant other 

Your mate, spouse, husband, wife, boyfriend, girlfriend, steady and/or lover. Used when you don't want to be too specific, or when the details are nobody's business.

Why's Roger always talking about his significant other? Why don't he just say girlfriend?

Because his "girlfriend" is a guy named Bruce.

significant other by Alex Firmament February 20, 2009

statistically significant other 

A significant other whose status is not created by a agreed-upon relationship status but by how much time is spent with them. Could also be considered a behavioral significant other.

Combination of "statistically significant" and "significant other."

Since he spent twice as much time with Karen as with any of the other girls he was dating, his friends called Karen his statistically significant other.

statistically significant other by Brett Lider February 5, 2009

Significant other 

When you don't want to put a label on a relationship. But your involved with someone closer than anyone else.

He's not by my boyfriend but he is my significant other and i will always be his ride-or-die

Significant other by Syrenfire May 2, 2016

clinically significant other

A significant other defined by an (undesired) medical condition, not by a agreed-upon relationship status.

Combination of "clinically significant" and "significant other."

They were only dating casually, but when he gave her the Clap, he became her clinically significant other.

clinically significant other by Brett Lider February 5, 2009

(in)significant other 

a phrase used to describe the cunt or douche that you used to officially have a relationship with that is still part of your life for whatever stupid reason that you're coming up with.

I took my (in)significant other to lunch yesterday. Not five minutes had passed before she was correcting my grammar and telling me that I was eating with the wrong fork. I LIKE THE LITTLE FORK.

(in)significant other by Milowe October 22, 2010

significant other 

Partner in a relationship; mate or spouse; boyfriend or girlfriend; companion.

Josie is Keith's significant other.

significant other by VAKI5 May 14, 2005