It is typically used when the clitorophallus is of a size where it is not clear as to whether it is a penis or a clitoris (ambiguous genitalia).
[1][2] Often it is a matter of size that leads people to differentiate it as a penis or a clitoris,[3][4][5][6] though placement of the urethral meatus may also play a part.
During sexual development of an embryo, the clitorophallus is typically referred to as the "genital tubercle".
The stages of development between male and female embryos are identical until around the 9th week post-fertilization, thus the clitorophallus is not distinguishable as a penis or a clitoris.
These occasions may occur when someone is intersex, which is also referred to as "disorders of sex development" or "DSD".