What does boobytrapping a care package mean?

Answer 1

in the video game Call of Duty: Black Ops players can plant an explosive under an item that gives all sorts of special weapons and attacks to anyone who opens it - so it explodes when they try to open it, killing anyone close by

the care package (a big crate) is called down by throwing a smoke grenade on the spot you want it to appear. If you plant a claymore mine on the smoke grenade before the package drops, anyone approaching the care package from the right angle will trigger the explosion