"Eye certain. Finger Lightning. Aim Death." is a red text modifier on Sniper Rifles in Borderlands 2
Grants Weapon Effects
Extreme Critical Hit Damage
Reduced Normal Weapon Damage
References in popular culture
This quote is a reference to the 1841 book "Deerslayer: The First Warpath" by James Fenimore Cooper.
The relevant paragraph says:
"That good name for boy - poor name for warrior. He get better quick. No fear there," - the savage had strength sufficient, under the strong excitement he felt, to raise a hand and tap the young man on his breast, - "eye sartain -finger lightning - aim, death - great warrior soon. No Deerslayer - Hawkeye -Hawkeye - Hawkeye. Shake hand."