What is "unblocking"

Usage examples of "unblocking".

Men liked a girl to be a bit helpless about things like unblocking sinks and changing electrical plugs and not knowing which bus to catch, but Chrissy could do all those things without fuss, taking them for granted in the nicest, most unassuming way, which probably was why the few men of her acquaintance, while liking her, tended to ask her advice and then go out with some feather- witted blonde.