i go camping in secret

I go camping in secret is from the television show "How I met your mother" after Ted tells Robin that he loves her, he leaves and let's her think about if she loves him back. When he wakes up he thinks of what he'll say to Robin and decides to tell her to forget he ever said it. When he exits his room he panics and yells "I go camping in secret!" Which was an allusion to temporary Lyme disease.