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the guy whom you so desire to become your boyfriend, but isn't yet committed to you.
I need to call my future boyfriend to see if we could meet for dinner this week.

my future boyfriend took his neice to a baseball game today.

my future boyfriend just sent me a text!
by angiekalamazoo April 08, 2011
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Jul 29 Word of the Day
Someone who used to be a potential girlfriend/boyfriend, but no longer is.
Tim: Zack, is that your exgirlfriend?
Zack: No, she's an expotential. We never actually dated...
by brownsuite September 24, 2011
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