90's comedy show.
Character was an Aussie wildlife expert, clearly based on Steve Irwin (even though Irwin wasn't well known over here, at that time).
His shorts were always too small, which would result in one knacker falling out when he bent down.
The camerman would then point it out etc.etc.
I think I know who did it, but I don't want to mention his name in case it clouds your judgement.
Can't find a video of the character anywhere.