After your anus is overbearing with sweat from physical activity, swanus is created. At this point one inserts their hand into their undergarments and gets a nice steaming batch of swanus in their hand. One will then run up to someone who deserves some vial punishment, and rub their hand all over the other's face. This person has just been swained.
Brad owed me ten bucks for the fireworks, so I cooked him up a nice batch during ultimate frisbee and swained his ass as I was passing by.
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