1) Referring to
Timothy E. Upham, the character from Saving Private
Ryan. A noncombatant translator, Upham was
shy, somewhat soft, gullible, and generally a coward in combat. The outcast of the squad, he was more of a burden than a productive member.
2) A person who exhibits Upham-like qualities; the cancer of the team, or one who draggs down those who he's supposed to help, although unintentionally.
1) Cpl. Upham- "I looked up "fubar" in the
German dictionary and there's no fubar in there."
2) He was a real Upham during the airsoft game, he hid behind a
wall and let his teammates do the fighting and individually get picked off when he could've been saving thier asses.