Also see:
TEASE
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."
TEASE:
The sign "TEASE" is similar to "RUIN" but uses a double movement and a facial
expression that corresponds to the type of teasing that is going on.
The right "X" handshape is placed on top of the left "X" handshape (both "X"
handshapes with the knuckle pointing forward rather than upward. The
left hand doesn't move. The right hand slides forward twice.
Here is a side version of the sign TEASE: Notice how in his picture
it is good natured teasing. (Adjust your own facial expression to match your
intended meaning).
TEASE:




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