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A person that you share your life with. Such as a "co-worker", who you team up with in the office. A co-lifer is a person that you join forces with in life.
"Baby, I want to share our lives together. You are my co-lifer."
by ILoveMatthewZ April 19, 2010
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A fantasy relationship made up by fans that will never be real.

co-lifer: someone you share your life with in fantasy land.
"omg those two actors that people ship are such a colifer"
by miss swanqueen shipper August 20, 2017
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