It reads 'often a girl', 'especially a young woman' and 'esp. a teenage girl', but it doesn't say that a groupie cannot be a guy.
Not a teacher.
Student or Learner
Do you have the counterpart for males for "groupie"? I mean, guys chasing after a female singer or celebrity. Maybe not.
73) All the girls are hcaging him. They're like his groupies
While the term 'groupie' is used generally for women, this is quite a sexist fact. Men can also be groupies, but are more likely to be called 'Male Groupies'.
There is no word specifically for a male groupie in the popular lexicon, to the best of my knowledge that is.
I hope this helps!