I had sex with Tiger Woods too

The idea is you say something that a lot of people have done but is still a pretty good achievement and can't be either proven or disproven:

1) Used when one feels insecure about or overshadowed by another person's accomplishments

2) Sly comeback to someone who has just made a statement about how amazing they are

Person: I just got back from Somalia rescuing orphans for the peace corps. Man I'm awesome
Person 2: Yeah, well I had sex with Tiger Woods too