Make like a fetus and head out is a play on make like a tree and leave, referring to a fetus entering this world head first. It is a pun and means: go away! or leave now!
"make like a fetus and head out" he shouted whilst pointing at the door.
Phrase that was used by a charcter called Biff,in ''Back To The Future''triology.
Its a stupid phrase that only he used,so when somebody tells you that,or he just watched the movie,or he is joking(or he is stupid,and thinks it has any sense)
Biff:So McFly,why dont you make like a tree and beat it
Marty:<blink><blink>
Banging someone that you're really into and like hanging out with even when your not having sex. You don't love each other but take every opportunity to enjoy each other to the fullest.
Me and this chick Sasha make like a lot all the time... she likes to do it in public and in her bed while her husband is passed out on the couch...
It's incredible, I've never felt this feeling but now I know what it feels like to almost love and care for someone.