Hipfire kills in Call of Duty refer to kills that a player gets while firing their weapon from the hip, without aiming down the sights. This means that the player is relying on the weapons default accuracy and recoil control, rather than the increased accuracy that comes with aiming down the sights. Hipfire kills are often a challenge for players to achieve, and there are various tips and tricks available to help players get more hipfire kills, such as using weapons with hipfire-boosting attachments, playing on maps that are conducive to hipfire kills, and practicing accuracy and smart gunfights.