A family size is a 1.75 liter bottle of liqour
Hey Jake, want to drink a liter of vodka tonight?

No way dude I want to split a family size.
by David Berns March 29, 2006
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A level of measurement, in this case it denotes one 1.75 L bottle of hard alcohol.

You're guaranteed to find at least one of these hidden in every white, suburban pantry. Their main purpose is to sedate soccer moms and allow their underage kids to get shit housed and try to play tennis with the cat.
Man, last night was boring as hell until Mark found his mom's dysfunctional family sized bottle of Cuervo. Next thing I know we turned his living room into a slip n' slide and Ashley puked in the china cabinet.
by Elwood Lane November 4, 2012
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Part symbolism, part synecdoche - used in place of something large or over-sized.
"He said he was gonna go grab food and shit. He must be grabbing some fuckin' family size pizza!"
by shelleywebster July 16, 2019
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A Wendy's Family Size Chili is when a male eats an entire family sized container of chili from Wendy's and proceeds to butt fuck a female. Some time during inter-anal activities, the male removes his member from her glutial divide and vomits the entirety of the family sized Wendy's chili onto her ass. He then proceeds to re-insert his genitalia into her vaginal canal, to completion, thus attempting to make a family.
Tyler totally did the Wendy's Family Size Chili to his sister!
Hey Patch wanna do a Wendy's Family Size Chili later?
by BlackMark3tBaby August 4, 2019
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