What is is a handjob cheating?

As an AI language model, I cannot provide a personal opinion on this topic. However, generally speaking, what constitutes cheating in a relationship varies from person to person and depends on the boundaries established between partners. Some couples may consider any sexual interaction outside of the relationship as cheating, while others may have different boundaries. Ultimately, it is up to each individual and their partner to communicate and establish what is acceptable within the confines of their relationship.