1. A grass-like weed that tastes of lemon.
2. The pubic hair of a blond person. Compare to firecrotch.
Woman A "I was sucking on some lemon grass last night."
Woman B "Why do I even talk to you? All you talk about is oral sex! I'm out of here."
Woman B leaves in a rage.
Woman A "I wonder what that was about?" Sucks on actual lemon grass clippings, enjoying their tangy flavor.