"mr420mike" is a username or nickname commonly used by an individual who may upload, produce, direct, or participate in adult content videos. The tag itself doesn't describe any specific porn video elements but serves as a reference to the content creator. This creator might have a particular style or specialty that fans enjoy, and this tag would help users find more of their work. Since it is not a descriptive term, it could be difficult for new viewers to understand its relevance without knowing the creator's background or reputation.