1. Extremely exciting Celtic League matches involving rugby teams from Wales, Scotland and Ireland

2. to have sex
1. "Welcome to Scrum V, we have some Hot Celtic League Action for you tonight, Dragons v Ulster" - Eddie Butler

2. "I had some Hot Celtic League Action last night" - Mick, after shagging a random lady from leeds
by Johnny B March 18, 2004
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Boston Celtic's day is another way of saying St.Patrick's day. March 17th
Its Boston celtic's day?
isit? when?
Today! its St. Patrick's day!!!
Oh!!
by Phili Balla March 16, 2008
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When an Irish woman, crushes your skull with her thighs, whilst you are performing oral sex on her.
Me: While I was eating out Shelly she almost Celtic Thunder'd me!
by Dominic Pacheco August 18, 2019
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One not doing what one should be doing
1. Yesterday I was Celtic Smoking instead of doing my work and I got detention!

2. Hey Carl! Stop Celtic Smoking and get your head in the game!
by pownism April 4, 2011
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a cock that has blue tribal design tatoos on it
Bob: "Damn I feel good."
Mark: "Why do you feel so good Bob?"
Bob: "I just screwed a chick with my celtic snake!"
Mark: "Seriously dude you got one of those?"
Bob: "Ya dude I used it on your mom last night."
by u shit fuck January 20, 2012
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A religion that is the revival of the worship of all the gods of the Celts.
He's into Celtic pantheon worship.
by Judge dredd7 July 25, 2011
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