How much do you know about Hinedere? This page will teach you everything you need to know.
The Hinedere (ひねデレ) type refers to characters who have cynical world views, are cold-hearted, and highly arrogant. However, deep down they have a soft side that may surface after their love interest breaks through their shell.
Based on what I can find, this word seems to be a compound of Hine (ひね) which means twist (Google Translate?) and Deredere (デレデレ) which means lovey dovey.
And that should answer the question “What is Hinedere?” You can find more information on subcultures and terms just like this in my growing Otaku Encyclopedia, including all other -Dere types!