Tom Arnold Bear Grylls Made Me Feel Dirty ... In My Pants

8/8/2014 2:45 PM PDT

Tom Arnold On Bear Grylls' Show -- It Was A DUMP! (VIDEO)


Tom Arnold definitely would NOT call his experience on "Running Wild with Bear Grylls" the #1 experience of his life ... but it was damn near #2 ... as in he almost pulled a Roker and pooped himself.

We caught up with Tom at LAX to ask him about his outdoor adventure, and how he prepared for it.
Next thing ya know he's revealing a lot about personal hygiene ... and what he describes as "juice in your pants."

Yes, Bear craps in the woods -- if you've seen his show you know that -- but he may not be alone.