This is how Nasus wins against you.

When you push Nasus in, and you will, then for Christs sake DON'T WALK UP AND DOWN IN FRONT OF HIS TURRET ALL GAME LONG.

No, you are not going to kill him. Hes tanky, he has an ult that makes him more tanky, he has a slow and he has sustain.

No, you are not keeping him from stacking. No, you are not "sieging" him. He has the wave where he wants it. He knows hes not going anywhere, and he can see you going nowhere. He is perfectly okay with that. Chances are that he scales better than you (because there are not many toplaners who scale that well in the first place), and before you know it, he will be a monster.

No, you are not setting your jungler up for a dive Even ignoring that successful dives on an almost full health targets in soloQ are a risky proposition on the best day...you are diving a Nasus. A guy with the strongest targeted slow in the game, who gets extremely tanky when he fires his ult. That smells like a double kill. And even if you kill him: Nasus doesn't care. He will tp back to lane and resume stacking.

#What you should do instead

Ward his jungle. Gank his midlane Tp gank his botlane (Nasus wont follow, and even if he does there is almost nothing he can do) Siege up on his mid Take Herald Take Dragon

Do something productive with the positional advantage your faster push bought you. Walking up and down like an oaf and spamming the laugh emote to "provoke" a Nasus (Nasus players tend to be among the calmest guys you will meet, chances are hes not hearing your emotes at all over his Snoop Dogg in the Background) will not get you a win.