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1.
(Noun) A Dillon fast food sauce on Friday Night Lights. It's Smash's favorite sauce.

When used as an adjective, it just means it's really awesome sauce, or just...really awesome in general.
"Yo I need 2 burgers, well done, with some Alamo Sauce." (Noun)

I don't know what this sauce is, but it's some damn good Alamo Sauce.

That party last night was Alamo Sauce!
by Leaf101 January 10, 2012