The stimhack example is probably the first one I ever had happen to me (and then did to someone else), eeettsa goodun.
I think for runners a bluff is more about intention. I really want to go into HQ, but I'm going to spend my resources and clicks heading into R&D for a while. As they start to defend R&D more, my "bluff" is ready to go.
I think bluffs could be categorized between "In-World Bluffs" (i.e., the example above, a thing that could tell a "story" about the game at hand) or "Game Bluffs" (i.e., feigning confusion or worry; saying things like, "Uh, there's no way I can get in there." or "Shoot, why can't I draw my breaker?" [even though it's in hand). Thematically I like the In-World Bluffs more, plus some Game Bluffs can start to teeter toward dickery.
It seems like most Runner Bluffs are about holding cards until it's time to strike. Playing DDoS the turn you use it. Or the run into archives, "Just to Check," though you are setting up for a notoriety.