The work of maintaining a bro-like image via the consumption of sunlight.* This could be seen on Beaches and college campuses throughout the United states. (note: also possible around fires, at Dave Matthews shows, etc.) Specifically takes place with men ages 18-24, "chill" (see chill) outside in little teams, or "teams". (note: glasses, vintage shirts, shoes, and Abercrombie and Fitch paraphenalia are fundamental signs of brotosynthesis.) Typical, less clinical, synonyms include but are not limited to the following: chillin', hangin, livin' the fantasy.verb: brotosynthesize*Recent researches indicate that intake of cheap beer may facilitate this process; this has maybe not yet already been verified.