The sign for "ruin" also means "spoil" as in "spoiled milk."
The dominant-hand "X"-handshape is placed on top of the non-dominant "X"-handshape (both "X"
handshapes have the knuckle pointing forward rather than upward. The
non-dominant hand doesn't move. The dominant hand slides forward and
(usually) pivots up. The movement of the dominant hand is somewhat like a kid popping a wheelie on a bicycle.
RUIN / SPOIL:



RUIN: (side view)



Note: If you mean spoiled as in "spoiled child" use the sign
PET with an exaggerated movement and a
disapproving facial expression."
Also see:
TEASE
Notes:
A student asks:
"The signs 'Ruined' and 'joking/teasing' look similar.. are the
signs truly similar? If so, does the sign change because of the
facial expression?"
Answer:
The sign for "ruined" tends to do a different movement (from tease).
The movement of the sign RUIN could be described as similar to a
motorbike popping a wheelie. The dominant X hand slides / scrapes
along the top / thumb-side of the non-dominant X hand and then the
crooked index finger pops upward (while the base of the X hand
continues sliding forward (still in contact with the non-dominant
hand).
Also see:
https://youtu.be/wiLwLKraAPk
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American
Sign
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ASL resources by Lifeprint.com © Dr. William Vicars