high school only
Janice: Todd is such a jerk. Why are you dating him?
Leslie: He's an hso boyfriend.

Jordan: So, do you think you and Sam will ever get married?
Paul: No! We're just hso. I'd never marry her.
by trout soup November 07, 2010
Hot Sports Opinion. Can be used to describe any controversial opinion stated with supreme conviction in its truth.
Bob got drunk at the Christmas party and started spouting some HSOs about how the elderly should be burned for fuel.
by Thad Blakeley August 08, 2005
Hot Solo Action: Female masturbation
That fly honie is getten some HSO on.
by NSO August 05, 2003

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