Funny word mix up

Saturday nights at the grocery store here in Laie are quite busy. Lots of people and long lines, but everyone visits with everyone so it's not a miserable experience. Tonight it was me, Shane, Erin and Krista. We get in line and are a little crammed between the guy in front of us (whom we know but he was already talking to the guy in front of him) and the ice cube case. Erin announces to Shane, "I'm feeling a little constipated..." at which he looks at her quirky and quizzically. Then she says, "Wait, I think I mean....claustrophobic....."