jargon.artrocity.com
New Hacker's Dictionary the Jargon File v 4.4.6
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 geek; see also propeller head.