1 definition by MacGruber
when one twin envies another, particularly when one twin tends to excel in mutually competitive activities, or when one twin sees the other twin as more "successful" in life.
Chris had a raging case of twinvy when his twin brother Frank, the accomplished and eligible airline pilot, recently conceived triplets just a month after Chris could only muster an only child.
by MacGruber May 30, 2007