The meaning of ''kook'

I read the forums a lot and I often see people referring to when there learning as looking like a kook or being a kook.
Now I don't know if it vary 's in different country's but I always thought a kook was more like a poser a person who could not surf very well but acted like they could or drives around with there surf board on there car posing but never gets out in the water.
or goes to party's telling everyone how good there are but cant even surf.
I mean I am learning but i don't think I am a kook just a noob or newbie lol.
Maybe I have the wrong idea of the meaning but i would be offended from the meaning I thought if a person called me a kook .
No big deal but just interested what others actually think it means or what does mean.
Now I don't know if it vary 's in different country's but I always thought a kook was more like a poser a person who could not surf very well but acted like they could or drives around with there surf board on there car posing but never gets out in the water.
or goes to party's telling everyone how good there are but cant even surf.
I mean I am learning but i don't think I am a kook just a noob or newbie lol.
Maybe I have the wrong idea of the meaning but i would be offended from the meaning I thought if a person called me a kook .
No big deal but just interested what others actually think it means or what does mean.