na-adjective, noun
Colloquial, slightly playful word for something or someone that is oddly unusual or peculiar. Similar to へんてこりん.
See also: へんてこりん
あの店の看板、へんちくりんなデザインだね。
That shop's sign has a weird design, doesn't it?
彼はいつもへんちくりんな帽子をかぶっている。
He always wears a strange hat.
The exact derivation is uncertain; likely a playful, emphatic extension of 変 (へん, 'strange') with the colloquial suffix ちくりん, possibly influenced by へんてこりん.