She underwent lower surgery last year.

She underwent upper surgery to align her physical appearance with her gender identity.

He underwent chest surgery last year.

I love to bed surf on weekends.

He is a couch-surfer and loves staying at different people's houses.

I met a bed surfer at the hostel last night.

I love bed surfing on lazy Sunday mornings.

He is a sex surfer who explores different sexual experiences.

I tried couch-surfing during my trip to Europe.

The Alfvén surface is a boundary in plasma physics.