Usually during a musical performance when the moogist, more commonly a keyboardist, will do a handstand on his/her moog/keyboard. Made popular by Jesse Johnson of Motion City Soundtrack
*at a mcs concert*
kid 1: dude!!! did you just see that guy do a handstand on his keyboard!!!
kid 2: yeah dud that was a moogstand! he does that alot its sweet...also its a moog not a keyboard way cooler
What some people call a mustang to sound cool in front of their friends. They also use this term when asked by an owner of a foreign car what car the mostang driver has.
Pan Ku: Hey man what car you got, i have a twin turbo 300z that can easily smoke anything.
Bennie Jean: Naw man, i got a mostang, which i claim is superior than imports even though its slow as fuck and uses 30 year old design for a rear axle/suspension.