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1.
1. Two males that share a passion for the environmental sciences

2. Any male that cares to keep the environment safe and clean
1. "I heard Norman and Peter are majoring in environmental sciences in college"
"Yea, of course man. They're envibros."

2. "Why'd you defecate on the sink man?"
"Aw sorry. I didn't know you were an envibro. I'll clean it up"
by shnerfmonster December 24, 2011
 
2.
1. Two males that share a passion for the environmental sciences

2. Any two people who protect the environment from unsafe/hazardous actions
1. "I heard Norman and Peter are gonna major in enviro when they go to college"
"What do you think man? They're envibros"

2. "Why'd you defecate on the sink man?"
"Aw man I'm sorry. I didn't know you were an envibro"
by shnerfmonster December 24, 2011