Today's Word of the Day means...
[origin unknown; perhaps related to British dialect geck, geke, ''fool''; according to David Maurer, ''said to have originated with a man named Wagner of Charleston, WV, whose hideous snake-eating act made him famous'']
To temporarily enter techno-nerd mode while in a non-hackish context, for example at parties held near computer equipment. Especially used when you need to do or say something highly technical and don't have time to explain: "Pardon me while I geek out for a moment."
See computer geek, propeller head.