Another term used for Ranch Dressing. It stems from the overwhelming use of ranch dressing by the sisters of the Delta Delta Delta sorority. They have been known to use gallons of "tri-delt sauce" at semi-formals and other food related functions. On some rare occasions they have used said "sauce" on dates and even each other.
Fraternity Brother #1: "Whoa...did you see those Tri-Delt sisters waddling to the buffett line in their size 14 Lilly dresses, must have chicken fingers and a TON of "tri-delt sauce" over there.
Fraternity Brother #2: "Yeah, man that is gross. Look at that one...I think she dipped her entire hand in the bowl!"
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