When one unintentionally tags along or goes to an event that one may not be wanted at. One feelslike the proverbial fifth wheel and like one is intruding and that one is not wanted. A very awkward situation.
Greg: I ended up going out to eat with Sarah's family last night.
Jeff: Really?
Greg: yeah, the problem it that it was a welcome home dinner for her sister.
Jeff: man, you totally gate crashed their cocktail party.
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Sarah: Greg gate crashed my family's cocktail party!
Georgette: bummer.
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Georgette: friends don't let friends go around gate crashing a cocktail party.
Jeff: ...awkward...
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!