The name of the group alludes to the south side of Swangard Stadium, where the supporters first started to congregate.

In 2003, the Southsiders felt marginalized by the front office and began depositing empty beer cups onto the field.

[7][8] The Whitecaps' expansion into MLS has also led to an increase in membership; it had grown from about 40 paying members to 100 in July 2010.

[9] At the group's annual general meeting, held in December 2010, paid membership was tabulated at just shy of 200 members.

[10] The Southsiders originated as a group of fans that enjoyed a European-style experience over the traditional family-friendly atmosphere during matches.