To be fair, I really think he is onto something with the seagull study. It could become quite an issue after the stadium is built and the segulls decide to start shitting everwhere.
Kerfoot would then turnaround and tell the city they needed to address the issue, meaning the tax payers would be on the hook for some type of clean-up project and further seagull management process.
You need to look no further than the Burnaby Lake grass fields and the issues surrounding the geese there, it is a mess.
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Take the piss (out of someone) vb. British -- to mock, deride, poke fun (at). This vulgarism has been in widespread use since the late 1940s. The original idea evoked by the expression was that of deflating someone, recalling the description of a self-important blusterer as 'all piss and wind.'