The insertion of the head into the anus of another.

when you're hungover as shit after a spending a night drunk as a skunk

The act of putting your head (the one on your shoulders) into a vagina or butt.

So me and my buddy were walking to school seventh grade year and we were talking about sex. Well I just saw a video of a guy putting his whole head in this girl's vagina and I was like "let's call it heading".

when lesbien 1 spreds her legs and when lesbien 2 bends over with a lubed up head and runs towards lesbien 1 and inseerts her head into liesben 1 minge repeatly for added pleasure

The ACTUAL definition of heading is heeding reading a book.

When someone puts their head inside of a vagina