An unfortunate situation in which a large splinter lodges itself in the asscheek tissue of an individual through forced entry.
Oh my god, That man copped Masters Splinters.”
by Glizzy goblin January 19, 2021
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A person who looks like a rat, but with the training of the Karate. So in essence Master Splinter is just a Ninja Rat Boy
Ahh! Master Splinter you have honoured us with your presence.
by Maverick October 13, 2003
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Someone who looks like a rat. Derived from the teacher of the Teenage Mutant Ninja Turtles.
Andrew Bray is master splinter.
by Gumba Gumba February 25, 2004
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A rat who lives in a sewer with X-box speakers, 5.1 surround sound WoW speakers, Rainbow Six, and a Blue Dickies Jacket. He is also a trainer of the TMNT (teenage mutant ninja turtles) and has a afro.
master splinter has 5.1 surround sound 500 $ speakers.
by Ratfro September 5, 2007
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A sexual act preformed with chopsticks. You must insert a pair of chopsticks into the vagina or anus of your sexual partner open the hole and slide right in!
Hey baby, you ever tried The Master Splinter?
by Bic-a-boi June 17, 2018
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Similar to the word "Fist" in that it is both Verb and Noun, "The Master Splinter" by definition is a maneuver that requires a thumb splint to be done properly.

To have done The Master Splinter properly, one must first cover the splint in hot melted margarine and then proceed to forcefully inject said thumb+splint into the rectal cavity of a man or woman. This should be done with a running start to gain optimal momentum so you can then, as the "splintee" persay dives away, carry him/her down a Minimum Seven Yards of Slip'N'Slide.

The Master Splinter does hurt the "splinted" and "splintee" greatly as to one having a broken thumb and the other being so surprised. Thus the requiring of the margarine.
Gavin: "Did you see The Master Splinter last night?"
Todd: "What? We didn't play Turtles in Time last night.."
Gavin: "Noo.. Callum got his splinted thumb into someone and carried them all the way down our giant Slip'N'Slide!"
Todd: "How'd he get that thing in there? There's no way it could fit!"
Gavin: "I think he used margarine.."
by Thaddeus_Jones March 1, 2010
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