'Grrrl' is an alternate word for 'girl'. It refers to a woman who is admired for being independent, or creative, or strong. It is pronounced the same as 'girl', but with emphasis on the -ir- part of the word. This emphasis is done by lengthening the -ir-, so that the word takes about 3-4 times as long to say. The reason why it's written with multiple r's is that most of the lengthened -ir- sound is with the 'r'. A couple of other things: There is no difference between 'grrl' and 'grrrl', just alternate spelling. Also, there is another alternate spelling, and that is 'gurl' or 'gurrl'. I suspect that's what you heard.

It's possible it could be a few things. I would need the context to be sure. It is most likely a phonetic way of saying 'girl', with an exaggerated, and probably rolled 'r' sound.

https://en.oxforddictionaries.com/definition/grrrl In American English, girl and grrrl have the same pronuncation (with a clearly heard [r]). The word grrrl seems to be a 1990s pop culture innovation to create a word with connotations of assertiveness and strength as an alternative to the passive connotations of "girl." In American English, grrrl is pronounced the same as girl [ɡəːrl], not like garl [ɡɑːrl]. The vowel difference is the same difference between the "ger" of hunger and the "gar" of garden.

QuestionMark, Better late than never. Now that you know about your ability, it's worth giving a shot.

They have actually adviced me to become a teacher when I grow up. Sadly, I didn't trust my ability to teach back then.