look up any word, like eiffel tower:
 
1.
The first person at the front of a single line of moving traffic.
1st guy) Why is this traffic moving so slow.
2nd guy) There's a guy ahead of us that is driving the exact speed limit.
1st guy) He's the slowest common denominator
by escyr July 10, 2012
 
2.
The kid in class who slows down the rest by having to get every last thing repeated to him/her 8 times before understanding it.
Teacher 1) I hear you got Tommy and Linda in English class. I had them last year. They're some really bright kids.

Teacher 2) Yeah, but I feel horrible. It's damn near Christmas and we still haven't finished basic sentence structure because Kyle still doesn't understand subject-verb agreement and he asks me 2 dozen questions per class that I've already answered.

Teacher 1) That's always so unfortunate, when the brightest in the bunch are put in the same classes as the Slowest Common Denominator.

Teacher 2) Yeah. I wish there was room in the budget to have more advanced classes.
by daphunkeefeel1 July 13, 2012