Top Definition
1. An adjective used to explain things in a quick simple way that unlocks a mental set of ideas relating to the September eleventh terrorist attacks.

2. A racial slur against any type of Muslim of Middle Eastern descent.
Used in Family Guy in the episode "Tales from a Third Grade Nothing" when Peter and a Middle Eastern child compete in a Spelling Bee:

Tom Tucker: "Our next competitors are Peter Griffin and Omar Majah-resahh-- something September eleventhy."

It was a September eleventhy kind of ordeal when all the media outlets focused on Tiger Woods' sex scandal.

After seeing a September eleventhy kind of guy board the plane, I felt extremely nervous.
by AJHM June 12, 2010

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