tenders and boys being boys

Just a heads up, this is not about a food. So awhile back JP and I had discussed how we never gave the boys a name for their boy parts. Apparently Kung Fu Panda has done that for us. Both of the boys can be heard making comments about their "tenders." Yeterday the radio was on and the boys were dancing, and I even overheard Sammy say he was spanking his tenders. His back was towards me, so I really don't know what he was doing, except being a boy.
They both have think that booty and poop are funny things. They haven't laughed when they toot, but I think that will happen any day now. They are such boys...and Carlos even laughs with them.