dear all in the TV (show how I met your mother) I can't understand what I'll tell you something means:
Barney: how long has it been?( without sex)
Ted: fifty seven days
Barney: fifty seven days!! Ted, you are in a slump.
Ted: no it's not a slump. It's an intentional hiatus from girls. a slump is when you strike out every time you step up to the plate. but I'm off the roster, baby. I'm in the locker room sitting in the whirlpool and (I'll tell you something), it feels pretty good
(much obliged)
Top answer
“I’ll tell you something” = “For your information, from my point of view”
— Wilpeter
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