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Passatruckaphobia 

An affliction which suddenly strikes timid left lane drivers when confronted with passing an 18 wheeler in the right lane. Those suffering this ailment slow to whatever speed the truck is going, their hands sweat, mouth goes dry, and balls shrivel at the thought of passing the huge truck. This creates abberant thoughts that their lane is too narrow, or the truck will swerve to crush them against the guardrail, or demons will fly out the truck to attack their tires. This is also thought to be the reason the afflicted refuse to pull into the right lane no matter how much you flash them to move over. This creates a roadblock so nobody can pass, even those who do not share the illness. Side effects include behavioral swings in other drivers that can lead to road rage and demolition derby syndrome.
Guy: I can't believe this guy ahead of us! Just because we're going up a hill he's going 45 mph in a 70 mph zone. What the heck is his problem?

Chick: Don't fall into demolition derby syndrome, honey. He obviously has passatruckaphobia. Poor guy can't help it if he's too stupid to understand that big bad truck's not really gonna hurt him if he passes it.
Passatruckaphobia by Tbyrd2211 December 27, 2011
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square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
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A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

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"Yeah... I know."
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trucker's tan 

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I had a trucker's tan after driving for 10 straight hours on a sunny day.
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British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
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Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
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