Stimming is self-stimulating behaviors that involve repetitive movements or sounds. It commonly refers to behaviors, such as flapping one's arms or rocking back and forth, that are often seen in people diagnosed with autism. You don't have to be autistic to "stim." For example, tapping your foot when you're nervous could be an example of stimming. Stimming does look different, though, when it's an autism trait. Behaviors like finger flicking and twirling can become very excessive and obsessive i