a person you meet once in your lifetime when on vacation, but when the vacation is over you continue to keep in constant contact with each other via text, facebook, e-mail, post, phone calls, or all of the above.

A friend that only appears to you and you only, you can play around with the friend but sex is not possible.

A constant companion that nobody can see except children and the religious.

A fictional companion, often created out of loneliness. Imaginary friends can often be found congregating around definitions of non-celebrities, singing the praises of the person in question.

For Christians, is Jesus.
For Muslims, is Allah.
For Jews, is Jehovah.
For Zaroastrians, is Ahura-Mazda.

Any used-to-be friendly human idiot who has hurt you in any way, including leaving you out, bitching behind your back, or just generally acting selfishly and not thinking you would notice.

Coined from the terms imaginary friend and friend with benefits , an imaginary friend with benefits is most commonly found when a person is single, although it is not necessarily restricted to those outwith a relationship . They person will create an imaginary person that they will regularly engage in raunchy sexual activities with during either masturbation sessions or dreams. The qualifying features of a friend with benefits is that said person must be fully fabricated (not a celebrity or someone you know) and that they are a regular part of your self-pleasure routines.