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Seamus Finnigan 

Seamus Finnigan is a minor character in the Harry Potter series. He is desribed as having snady hair, freckles and being short. He is often used as comic relief and is best known througout the series for blowing things up, his Irish accent and is friendship with fellow Gryffindor Dean Thomas. He holds no significant plot but is recurring in other plots. In the books he asks Sir Nichols de Mimsy-Porpington how he can be nearly headless, but in the film the line is given to Hermione Granger. He explodes a feather while attempting to levitate it in a Charms lesson, a goblet of water as he attempted to turn it into rum ( and Ron Weasley claims once managed a weak tea before an explosion) and his potion in his sixth year Potions class with Prof. Slughorn. He saved Harry Potter from dementors in Deathly Hallows. In Order of the Phoenix he argues with Harry about the claims of Voldemort's return, claiming he believes the Daily Propher and he refused to join Dumbledore's army, until later in the book/film when he apologies. In this sub-plot Harry insults his mother.
Finnigan is Irish, his mother a witch and his dad a muggle who he claimed left when he found out about Seamus' mother. His patronus is a fox and he is often shipped with Dean Thomas (deamus) or Lavendar Brown.
The phrase, 'I did a Seamus/Finnigan/Seamus Finnigan' can also mean 'I cause an explosion'.
He is played by Devon Murray.
1) Person 1 'RUN! I just did a Seamus Finnigan!'

Person 2 'WHAT!! You idiot!'

2) Person 1 'Did you Seamus Finnigan in that chapter?'

Person 2 'Yeah, so heroic saving Harry like that'

3) Person 1 'He's so sexy. So bloody Irish. I love him'

Person 2 'Oh, here you go on about bloody Seamus Finnigan again'
Seamus Finnigan by ludii_90six January 1, 2012

seamus'd 

the act of going out on holidays or the weekend and drinking to the point where you can't talk coherently and wake up hand-cuffed to a hospital bed the next morning.
Bro - "I'm going out and getting SEAMUS'D this weekend!
seamus'd by relyt19 April 8, 2011

Seamus Heaney 

A ruthless villain who will stop at nothing to torture the younger generations by writing poems of any century other than the 21st.
Seamus Heaney by Thomas Heaney December 9, 2017

seamus moment

when something goes wrong in a game or in person it's considered a seamus moment. if you end up losing in any way shape or form in a game or in person it's considered a seamus moment.
seamus moment by donovan VI March 22, 2022

Seamus Doherty

An absolute unit from Nobber and just an all round madman
Townies: look its Seamus Doherty run