The name given to a technical exercise (also known as 'rudiments') performed on a drum... by a drummer, consisting of an alternating pattern using both left and right hands. There are many types of Paradiddle, for example:

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Paradiddle is one of the most basic rudiments used both on a kit and a snare drum. Although simple it can be adapted and added to to become a really cool bit of drumming...Often used in an organisation called drum corps...

The act of molesting a handicap, or paralized individual. Hence para diddle

to bounce the head of one's penis against the outlying area of a vagina without actually penetrating