Top Definition
Sources of protein that are integral for bros a.k.a juice heads a.k.a men with Ph.Ds in "bro-science". Ex. whey protein, grilled chicken, fish etc. see Brotein
Paxton: Yo Shaq my roommate Alban just copped a large tub of Gold Standard Whey protein cookies and creme flavor!

Shaq: Damn son, thats some grade A Growtein.
by shaqdiesel006 November 08, 2012

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