Green’s Dictionary of Slang

malco n.

[abbr. SE malcoordinated]

a general term of abuse; thus as v., to act in an uncoordinated manner.

Varsity Online 7 May 🌐 Dan Madden, the Falcons’ keeper, either saw it late or completely malco-ed, as he seemingly dived over the ball.
SRCF 🌐 So surprised was I by this fortunate turn of events, I completely forgot how to not be a total malco.