Pretending to work. Covertly engaging in fun activities instead of work, but still appearing as a motivated employee.
Three reasons for the origin of this word:
1) A serf was a form of slave required to work a master's land. Lower-level employees in a modern business can also feel like slaves.
2) Surfing the internet is a common activity undertaken instead of working
3) Surfer culture is traditionally laid back and does not value working
Guy: Hey boo we going to the show tonight?
Girl: Okay!!!
Guy: What time you want me to come get you?
Girl: I don't know yet, I'll call you when I'm ready.
Guy: Don't be selling dreams, you know I'm trying to get up with you.
*girl never calls and usually turns her phone off*