By not paying attention to any threats, you can act a lot faster in a turn. This lowers your armor class to just what you are wearing, but you sequence much faster in a combat turn.
”— In-game description
With this trait, your sequence gets a +5 bonus, but your natural armor class is decreased to zero. You must wear armor to have an armor class.
By not paying attention to any threats, you cause a lot more damage (+25% more damage). This lowers your armor class to just what you are wearing (no Agility bonus to armor class), but you do more damage with every attack.
The following is based on Fallout 3 cut content and has not been confirmed by canon sources.
With this perk, you gain +20 AP but lose 20 Damage Resistance.
It is found in Fallout 3 data files (GameEffects/ActorEffect/Ability/PerkKamikaze); the prerequisites and description are unknown. As Fallout 3 has no traits at all, it was probably cut at an early stage of development.
End of information based on Fallout 3 cut content.
Fallout: New Vegas
This trait gives you an additional 10 action points at the cost of two points of Damage Threshold.
Though not listed in the description, the actor effect that provides the bonus action points, PerkKamikaze, also reduces your Damage Resistance by 15.
J.E. Sawyer's Fallout RPG
By not paying attention to any threats, you can rush in where angels fear to tread. You are easier to hit, but you act earlier in combat. -2 to Evade, +4 to Combat Sequence.
Behind the scenes
Kamikaze, in Japanese, means "Divine Wind", referring to the two windstorms that destroyed an overwhelming Mongolian naval force about to attack Japan in the 13th century, and was used in World War II to refer to Japanese suicide attackers.
The picture for this trait in previous Fallout games shows Vault Boy holding a knife in his right hand and a pistol in his left. In Fallout: New Vegas the picture shows Vault Boy holding the weapons the other way around.
The image of the Vault Boy in the earlier games icon appears to have the same hair-style as the Marvel X-Men character, Wolverine.