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1.
a quick bubble writing type display of graffiti, usually an abbreviation of the writers tag.
i just dropped a huge throwie on this bus shed
by Anvl February 24, 2005
 
2.
a small less time consuming piece but much more detail than tags and some hand styles.
Aye,did you see the "SLR" throwies all over freedom and main? ......yeah i hear he racks all his stuff
by GhostReper September 25, 2007
 
3.
An LED light taped to a 2032 3volt lithium battery and a high powered magnet.

Used as a form of graffiti.
Hey, I made some throwies last night, wanna go throw 'em at something magnetic?
by Junior29 August 30, 2006