The story
Blend of Gore/Lieberman + sore loser, from the idea that the two men were "sore losers" who did not want to admit that George W. Bush won the election in 2000.
Etymology from Wiktionary, CC BY-SA 4.0.
Sore Loserman
Today it means: Nickname for Al Gore and Joe Lieberman, the 2000 U.S. Democratic presidential nominees for president and vice-president, respectively. Full definition →