If you are tickled in the right place it can loosen up muscles holding the pee in, but generally if you laugh when you're tickled it's the pressure from that which pushes out the pee.
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The act of laughing causes the diaphragm to rapidly inflate and deflate. Seeing as how it is very close to the bladder, the constant change in pressure on the bladder causes one to urinate.
Tickling might make a person urinate because they laugh too hard. This puts pressure on the bladder which can cause urination.
People often lose bladder control when they laugh too hard or cough too hard - you're moving the muscles in the abdominal area and they're pressing on the bladder too much to hold it in.
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