The word "check" here is used in the sense of "have a look at" or "check out" and not the paper personal paper method of financial remuneration - which in Canada is spelled "cheque."
On every level this is meant to be an inside joke - especially if you have studied Scrapbook: a story of art closely enough to have noticed the evolution of artist Jack Whyte's signature - there may also be a sub joke related to Nike's Winged Spirit of Freedom - but I doubt it.
