Following a stupid comment the person who said it must bend at the neck and look at the floor. thus putting their head down in an act of shameful embarrasement. After this the person cannot be made fun of.
A term for being extremely high, particularly off some real high-grade headies. This refers mainly to the comic high one sometimes experiences when he/she laughs uncontrollably at everything.
"Yo those were some killer pines dude, I got a nice head circus goin' on right now."
"Yeah I got a real Barnum & Bailey's up there man, those were some ill shrubs."