Performing an act that is fun or spontaneous.
An item of affection considered to be cool.
Carrying ones self in a manner that dictates their personality preference for spontaneity, and otherwise all around dopeness!
Taking a random, last minute vacation would be #swagtaneous
"Flew across country to NYC on 2days notice, just to see Jay-Z perform at MSG."
A spontaneous purchase, that boosts one's "Swagger" might be #swagtaneous
"Woke up and decided to go shopping today"
Stopping at a bar for drinks, and leaving with phone numbers or members of the opposite sex. This would make for a #swagtaneous night.
"Tonight was supposed to start as a work happy hour and it ended pretty wild!
Can be used as a noun, verb, or adjective.