giant imaginary friend

this term comes from a turkish girl named burzou. pronounced puuur-jzooo.
we were talking on day and she said that i am a giant imaginary friend. i said what? her english is very bad. she said i mean you have a giant imaginary friend, like big dreams head. i was like what? im a giant imaginary friend? she was like no, how do you say big imaginary head. i said ohhh. i have a BIG IMAGINATION. and she said YES! you have a giant imagination. and i was like oh, i like ginat imaginary friend better.