A BMW enthusiast. Comes from the fact that the BMW logo was inspired by a spinning airplane propeller, which dates back the BMW's beginnings as an aircraft manufacturer.
Man, that kid is such a Propeller Head! He knows BMW's like the back of his hand.
Non-geeks use this term in refrence to geeks. Geeks use this term in refrence to a geek that spews crap that he/she doesn't really know anything about.
non-geek: That guy has a Linux pda, what a propellerhead
geek: That propellerhead is vomiting random termanology in my face.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.