To "Agnew" is to
laugh at a private joke, which you are not part of.
Different uses:
To agnew, to have agnewed, to be an agnew,
epic agnew
Sam: Remember that time me and you were in Mikes car and rolled up on that
dude and that underaged
girl making
love?"
Oli: hahaha, we weren't afraid to hit people in the face
Rob: hahahaha
Sam: Rob, you just pulled a total agnew