Someone who disagrees with something that is widely accepted by others, seemingly for no reason. The word comes from toothpaste advertisements, which often claim that "Nine out of ten dentists" recommend using their brand of toothpaste.
Mark: "I was making plans with the boys, but Adam kept arguing about all of our plans even though everyone else was on board."

Craig: "Man, the tenth dentist really had to go and ruin the fun for everyone, huh?"
by dKoschei August 15, 2019
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Played by David Tennant.

Considered by many (mainly new fans of Doctor Who) to be the best Doctor ever. Regeneration of Christopher Eccleston's Doctor. (ninth Doctor).
by Mandaese August 3, 2010
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To fake an orgasm by splashing previously created and preserved semen onto your partner.
"I had to pee so bad, so i reached into the nightstand and pulled out the vile of semen I keep- just in case. Moaned a little and splashed it on her... First time I ever got to tenth base"
by Tim Gruich August 11, 2008
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(adj) 1. Referring to anything passé.
2. Demonstrating disregard for homeland security.
1. Ally’s mum had her colours done. That shit is so September-Tenth.
2. Feeling the urge to purge? Bulimia is so September-Tenth.
3. Can you believe they didn’t search my bags in Newark? That is so September-Tenth.
by -g. September 28, 2003
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1. The day I won the Spelling Bee and showed those dumbasses who truly was the most intelligent.
"Everyone still talks about January tenth, the Spelling Bee of seventh grade and how that one kid proved he was better than those bitches!"
by Marah Stevenson Ki October 16, 2019
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