Seamin is the genes that come out of a man after Wacking off or Bumping Uglies with a women/man.\r\n\r\nSlang Terms: Jizz,Man Chowder, cum . Seamin, Mayonnaise \n> If you've ever arose in the morning and noticed your b.v.m.s are wet is because you had a wet dream last night and seamin came out of your dick.\n