Saw this on twitter:
A: マオにゃん、シドギャの彼女が出来ない僕に一言くれたら幸いです ...
What is 染めちゃえ here?
closed as off-topic by Earthliŋ, Eiríkr Útlendi, Flaw, istrasci, Szymon Aug 16 at 4:01
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Just an idea: Maybe it means that someone has been in contact with X for so long that they have been influenced?
Like a white shirt would get a bit blue if you wash it together with blue clothes. A metaphor that can be found in French with "déteindre".