a person with questionable instincts; a crowd follower; an adherent to conventional wisdom.
Every gilhooly gambler in America loves to bet on the Yankees.
by Rudy1957 January 31, 2008
1 more definition
A nickname for the male privates / family jewels
Ouch! that guy just got hit right in the Gilhoolies
by HavCol September 19, 2010