Name that fastener!

twist them 90*.....not sure the proper name for them but looking in the jeff foxworthy dictionary I came up with..... themclippythingiesthatifyastickascrewdriverinemthemsuckersbreakbutifyatwistem90*the pieceofmetalyawantinyourhandscomesoffandcanalsobeputbackonwithoutanysparepartstoholdtheheadlinerinclip...whew that word is one long sucker. I hope I spelled it right?????