Must be British slang.
From context, I think it means rinse it off the shelves? Make it go out of stock?
I don't think the tweet warrants the backlash, esp if that's the style there. It hardly seems malicious.
It seems Somali girls are more likely to wear abayas and dresses than the average Arab girl. I was watching the farewell address and the senate hearing, and was surprised when Al Franken pulled up a picture of a middle school classroom of Somali students he visited; all of them were wearing jilbabs with skirts.
@02:38