Someone who constantly lives in their own dilusional bubble. They always harp on about pulling "fitties" ALL the time; "riding ALL night long" and having great "footballing vision/skills". Realistically everyone knows a dilusionist's life is duller than an old grannies' haemorrhoid infected ass, but unfortunately they will never realise this!!
My mate told me he pulled a northern fitty at the weekend and ended up riding her all night long. What he didn't realise is that i saw the hairy munter leaving his house the next day and she said he fell asleep after spurting in his boxers......the man's a f*cking dilusionist!!