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4.
The uncomfortable sensation caused by water going up one's nose.
Man, I shouldn't have tried that underwater somersault - I have major horseradish. Ow.
by Womanana July 10, 2008
 
1.
adj.) utterly inaccurate

used to express an opinion of disbelief
His/Her teaching method is horseradish.

or

That referee call was horseradish, if you ask me.
by navigator883 November 06, 2009
 
2.
A condiment. Popularized by Arby's
Who the hell doesnt know what horseradish means, and why are you looking it up here?
by bjdhs May 12, 2005
 
3.
Like mayonnaise, it's not an instrument.
*Patrick raises hand
Squidward: Horseradish is not an instrument either.
by beeeel March 04, 2014