To declare a winner when it is not someone's right to do so.
Seeing a reasonable punch in a boxing match, the announcer did a Samin and declared a winner. He was surprised later to see the judges did not share his opinion. Present tense is: Do a Samin.
Creatures that reside in the great ocean that you do not want to encounter while participating in various aquatic activities (i.e. a sneal, see aforementioned definition)
Oh snap I just touched a saminal!