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1.
1. Very cool; used to refer to a popular group or person at a party or social event.
2. A person at a party who will randomly partake in borderline homosexuality; i.e. giving excessive amounts of close handshakes to other males, "grinding" on other males when dancing.

*Note: The different definitions can be implemented with different context and tone.
1. "Dude that party last night was so Guellard, bro!"
2. "He was cool until he started getting all Guellard on some dudes in that room."
by I'm Guellard, NO HOMO!! September 06, 2010