Tree Onion Puns

I was at work riding around with my coworker and buddy, he's married and already an old pervert at 29. We were driving down the interstate in traffic and looking at hot girls as we drive, we get into the far right lane, to where I have nothing but trees to my side. He says, "damn man that chick was hot" as a car passes by and I replied, "I ain't got any bitches but I've got a few birtches over here!" And cracked up. We work for a stump grinding company, this is an onion joke!