Esperanto Slang

Want to sound cool?  Drop some of these in an Esperanto conversation!

Esperanto	Meaning
bonantagulo	a lazy person who learns only a few simple Esperanto expressions such as "Bonan tagon!"
etoso	ethos, atmosphere, fellowship, "karma" (as of an Esperanto convention, etc.)
krokodili	to speak one's native language in a group of Esperanto speakers
mojosa	"cool"
samideano	Esperantist
verda papo	"green pope": one who talks at great length about the ideals of Esperanto

Thanks to David Simpson for this summary