This is the second video with this guy that I watched, the first was graffiti around Chernobyl. It should begin around 6:30 Anyway, what is the significance of the symbol?
When found in conjunction with swastikas, penis symbol function is usually anti-Semitic. Circumcision may not always be depicted clearly, or at all.
Instead of a penis, it might just be a Dick or Dick Head As in : Such a Dick ; What a Dick ; Acting like a Dick ; Don't be a Dick So instead of penises in the graffiti, it may be just a bunch of Dick Heads