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1.
The yellow-brown stains that collect on the armpits of a shirt. It can occur on any type of shirt, but primarily refers to white v-neck undershirts, as worn by the prophet Al Bundy.
Jeff, "Why don't you try washing your shirts with bleach. You got some serious Bundy spots going on."

Matt, "I know."
by dooshkanew October 10, 2009