We have a few words around here that we've never heard other people use. Thought I'd share them with you in hopes that you'd also have some to share.
attackle (uh TACK ul) - verb meaning to attack and/or tackle someone, often involves pouncing and tickling
americaussipina (uh mer i CAW see pee nuh) - adjective used to describe someone, my sister, for example, who was born and raised in America, works with Australians, and lives in the Philippines and speaks quite strangely when combining the language of those three countries
synonyms for the above word include:
filipaussican (fil i PAW see cun)
aussipinican (aw see PEE ni cun)
So, does your family have any words that no one else uses?