What you say to someone when they bumble, trip, mis speak or generally screw up.
Beginings: Two 80 year old women named Helen and a bad pizza commercial started this fond come back. The one Helen was affraid of chemically treated lawns and drank too much. The other Helen swept her grass. The pizza commercial included, "And it's stuck again Helen."
Your friend passes by you and trips. You reply, "Ya big Helen".
Your friend does something stupid, comes back and tells you about it and you say, "Ya big Helen."
You do something mean or off the cuff. Your friend pushes the side of your head and says, "Ya big helen."