A length of measurement which is more than a foot but less than a yard. Often used in connection with having a big penis.
Men who carry a newby between their legs are often prone from passing out due to an influx of blood rushing to an erect penis.
“Wow said Jane, he could do some damage with that newby”
“He had one hell of a newby on him”
“Lucky he is riding a blood bike if that newby gets hard he will need a transfusion”