Adjective: An immature move
1) Don't be a wallydick.
2) You're such a wallydick! I cant believe you're mom called all of our parents and told them about what happened!
3) Way to be a wallydick and tell my girlfriend i hooked up with susie!
1) Quit wallydickin' around!
2) Here we are trying to be serious and your in the corner wallydicking around as if this problem doesn't apply to you.