Often used in first person
shooter games, "spotlocking" is when a player sits somewhere and aiming directly at a passage of some sort and therefore "spotlocking" that area.
It could be a doorway or a tunnel for
example, and players that runs through the passege are easily shot down.
"Spotlocking" is mostly used by some camper
noob who cannot get enough kills.
"
OMG, some n00b is spotlocking the door, I can't get through"
"Guys I need some kills, I
think I'll spotlock this
corner"