Top Definition
n. A driver who accelerates when you signal to change into their lane, even though they have a lot of space to let you in. Very common in Los Angeles driving. Seeing your turn signal, they instinctually step on the gas, and get right up your a**, like a suppository.
I almost had a bad accident because I changed lanes and that signal suppository nearly rammed into me!

It's so hard to change lanes because of these signal suppositories!
by Doctor Science January 30, 2011

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