when i put a new string on my guitar(D string), I tuned it 3 steps up accidentally. Did i warp my neck or something? I immediately detuned it to normal.
prolly not.

i mean, you could look at your neck, it's just a suggestion.
98% of people have read that stupid 98% teens and alcohol sig, put this in your sig if you like getting hammered.

Thats it.
Even if EVERY string was tuned up for hours before being tuned back down, there would be no measurable warpage.
No. But how the hell did you not BREAK it????

The string I mean.

My things:
Bowes SLx7
Washburn WG587
Washburn X40Pro
Washburn X50
Washburn HM24
Washburn WR150
Laguna LE200s
Arietta Acoustic
First Act
Valveking 112
VHT Deliverance

the 5th string was a .032 gauge. The reason why I tuned it up too high was I tune it with a peg winder.

I looked at the neck and it looks fine, but there might be a slight warpage that I might not be aware about.