How does on deal with a Fed Nasus?

So I bet everyone knows this situation. You have a team that let Nasus just stack endlessly, feed him a lot in the early game and all you are able to do is just stand there and take the 1-shot to the face. Has anyone been able to win in this situation? Full tank nasus who has a 99% slow, an Q who deals 1500 damage. The only way i have seen people handle him at this stage is if he goes in without his team and 1vs5 and get kited to death, but with this new buff to him after playing with or against him for 3 games I have seen no accomplishment against him,even if they gone 1vs5 in all those 3 games.
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