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1.
Not quite gullible enough to be a gullibull.
A gullicalf will often accept something tenuous but then realise he's becoming a gullibull and step back from the brink.
From Wayne's World 2: "Come on! Do you think
I'm a gullibull or even a gullicalf?"
by Bradders1011 April 01, 2008
 
2.
Not completely gullible. One who is gull of a calf rather than a full adult bull.
John is pretty gullible, or maybe just gullicalf.
by Megalomaniac October 14, 2005
 
3.
n. Someone who is extremely gullible to the point that causes them psychological or physical pain and suffering . They are not even a gulli"bull" they are instead the younger form or immature "gullicalf."

Made popular by movie, Wayne's World 2.
Steve is such a gullicalf, he always believes me when I say the stove is not hot. He never learns from his burns.
by Jive Talkin July 23, 2008