[初级阅读] H&M 中的一个小问题求助

H&M and the long weekend一书中，第12页有一段话，不懂什么意思, 请高手解惑：
“Mudge is bored. I'm bored. Boy, is this boring."
Henry's father frowned.
"February cranks?" he asked.
Henry nodded.
"Winter grumpies?"
Henry nodded again.
"Pre-spring meanies?"
"Okey, Dad, okey!" Henry said.

其中的三个短语是什么意思呢？谢谢！