你长的真磕掺
[nĭ zhăng de zhēn kē chān]
This nickname translates to "You're truly addicted", but it seems there might be some slang or colloquial expressions here that do not directly make sense in English without context. Generally speaking, 'knock' may have the meaning similar with beat, and 'chān' may relate to mixed or complicated. The whole nickname expresses complex feelings towards another person.