1. Getting screwed
by someone through a course of lies and manipulative behavior.
2. Anal penetration, sodomy. In general, another term for fucking someone.
Originating from Gary Stinson, insurance salesmen who was convicted of fraud and embezzlement in California.
1. "That dude stinsoned me out of $10,000." or "That was a total stinson."
2. "I stinsoned that chick hardcore."
3. "That was a sweet stinson you pulled."