Butting heads happens when a pregnant female and a male with an extremely large cock are engaging in sexual intercourse. As the male begins to vigorously thrust his large cock into the pregnant females vagina, and gets deeper and deeper, eventually the head of his dick will begin butting against the head of the unborn fetus, which is commonly known as butting heads.
Jameson: Hey Gary, I heard you were banging that pregnant hooker last night.
Gary: Yeah, I did. And I’m pretty sure that baby and I were butting heads most of the time. I probably gave it a concussion.
When you want to give your bro a high five or handshake, but he has Coronavirus, so you knock dicks together instead.
Bro 1: I went to high five my bro on his successful penis enlargement surgery the other day, but he had Coronavirus.
Bro 2: What did you do?
Bro 1: We decided butting heads would be safer.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.