oisin can be used to describe someone who is ill-mannered or ignorant of other peoples feelings.
it can also be used to describe how someone acts around others. e.g. lying, deceitful

Another way to call someone in a normal conversation is a snake or a liar.
That guy is such an oisin.
by Izaya.H December 20, 2017
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A massive faggot who only talks about himself, his love for dick, and how his name means Little Deer.
"Oisin is a faggot"
by OisinIsAFaggot February 13, 2018
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An annoying Irish ginger cunt who everyone hates
'Oisins in my group'
'oh poor you'
by Wagwanwhatusauingmyg November 20, 2019
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someone who choses girl over tokes and an all round simp
Are you oisin diamonding right now thas so freaky
by Simpy D February 27, 2022
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Gay prick who thinks he proper hard,lives in the shadow of his brother
by U gay December 29, 2018
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When you stroke you're pet shrimp up and down ur rectum until the shrimp crawls deep into you're pee pee hole and lays eggs
I feel itchy after going for a swim must of caught a nasty dirty oisin
by Big boy fionn May 4, 2020
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The definition is a phrase relating too an annoying gay boy who dosent participate in gang activities such as drinking and entering private property.
by paul kelly is god December 25, 2009
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