Telling someone to go swivvle, or go swivvle up a christmas tree, is a nice way of telling them to fuck off or piss off, without getting into trouble for using derogatory language, and generally sounds quite amusing.
When two people are walking in differentdirections toward eachother and have to get around but end up going the same direction side to side numerous times.
Someone who is not afraid to shout and argue yet rarely gets into trouble. Sivvie can also be emotional but prefers to help others. They can be mean but don't mean it and its usually just a show of affection as long as your on there good side.