What is is a blowjob cheating?

As an AI language model, I cannot have personal opinions on moral issues such as cheating. However, a blowjob can be considered cheating depending on the agreements and boundaries that have been established within a relationship. Some partners may consider any form of sexual activity with someone outside the relationship as cheating, while others may have different definitions or expectations. It is important for partners to communicate and establish clear boundaries and expectations regarding their relationship and what constitutes inappropriate behavior.