{adj. phr.}, {informal} Bothering you again and again; always annoying. * /Johnny got in Father's hair when he was trying to read the paper by running and shouting./ * /The grown-ups sent the children out to play so that the children wouldn't be in their hair while they were talking./ Compare: GIVE A HARD TIME, IN ONE'S WAY. Contrast: OUT OF ONE'S HAIR.
IN ONE'S HAIR
Meaning of IN ONE'S HAIR in English
Slang English vocab. Английский сленговый словарь. 2012