Many Gumbas don't know how weak they are or else they would never behave in ways that encourage others to stomp on their heads.
2. An insult used when you want to seem more polite than you feel. i.e. "It's nicer than calling someone a retarted idiotic bafoon."
MAN: I can't remember when my hair was that dark
WIFE: Wasn't it a few weeks ago!? (referencing his attempt to dye it which he regretted)
Man: You're a Gumba
dungeons and dragons