code/modules/mob/living/carbon/give.dm

/datum/status_effect/offering_item	Status effect given to mobs after they've offered an item to another player using the Give Item action (/datum/click_intercept/give).
/datum/click_intercept/give	While a mob has this intercept, left clicking on a carbon mob will attempt to offer their currently held item to that mob.
/atom/movable/screen/alert/take_item	Alert which appears for a user when another player is attempting to offer them an item. The user can click the alert to accept, or simply do nothing to not take the item.