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"
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