Someone who is socially undeveloped and may not have the maturity to cope with the real world. A swagyolo (kid) may have sudden urges to shout out "swag-yolo" when he/she notices someone of higher social class.
The word "swagyolo" is derrived from Moose Jaw, Saskatchewan, Canada.
Man 1: "dude, look at those swagyolo kids over there."
Man 2: "gross. What the fuck! are they playing pokemon