Top Definition
A person from Seymour Hill, Dunmurry (or the progeny there of) that exhibits the characteristics of a "hallion". ie. Uncouth display of loyalist slogans and or working class behavoiur.
Why did he start on yer man Danny from Twinbrook (neighbouring Catholic Est)? Cause he's a Seymourhallion'!
by Allinthemix November 06, 2009
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