Another Felix

Dark souls pvp use the term ganking considering the pvp matches are basically duels.

When you invade someone, the host of the world can summon random people who drop their signs to assist them. Usually frown upon.

Ganking is the act to come into somewhere and kill the enemy opponent there. That's a gank. Flanking is completely different, stop hating on MOBAs for being MOBAs.

@King Midas. Actually King Midas, that's just not even close to the meaning. The widely used term is actually referring to "gang killing" meaning a group of people attacking one person. What you described doesn't even make sense.