rubbing/holding/masturbating a penis and a hotdog together for sexual pleasure. it is performed by a
single penis-haver when they have no other penis to frot with.
the warmth of the hotdog mimics that of another penis, granting stimulation down the full length of the
shaft.
some prefer frotting to ordinary jerking off, however not everyone has a
friend or sexual partner to engage in frotting, therefore the frotdog was invented