Aracnaboobphobia

Brother 1's gf: Yesterday during organic chem, we made chocolate covered pop rocks.

Me: Were they good?

Brother 1's gf: I dunno, I was afraid to try them.

Brother 1: You're afraid of chocolate covered pop rocks? What would that be called?

Brother 1's gf: Cocophobia?

Me: Cocopoprockphobia?

Brother 1: How about boob?

Mom: I think it has to have phobia after it.

Brother 1: No, just boob.

Mom: Can't you use a different word?

Brother 1: What? Like mammary glands?

Mom: Yeah.

Brother 1: You don't hear people saying, "She has great mammary glands!" or, "Ouch, I just got kicked in the mammary gland!"