When you let out a Greek/Roman fist pump after an exuberant moment.
"Are those black panthers? no, they're just white guys holding their fists up giving gromans"
ayon kay The Groman Definer ika-05 ng Mayo, 2010
A teenage guy who looks like he is 45 and a father of 4.
Girl: Man that guy looks like my dad, no he's just a gro-man!
ayon kay San12345 ika-09 ng Marso, 2016