Something males (mostly) get when they attempt to console a female who has recently found out about an unfaithful mate.
Sarah: I can't believe he cheated on me. Uh, what's that?
Daniel: It's a sympathy boner. Come get a hug.
Daniel: It's a sympathy boner. Come get a hug.
by howoriginal March 06, 2014
Get the Sympathy Bonermug.