Someone with a ridiculously obvious foot fetish (i.e. fapping to feet and often complimenting the sexiness of some random person/character's feet). To some degree, all footmasters generally
masturbate to foot fetish related pictures and videos on
Internet sources like Deviantart at least once if not twice or thrice per
day, although secretly. Many footmasters are probably under 18 years of age and would probably not take terribly kindly to it if another footmaster made foot fetish art of them. However, some teenage footmasters have proven to be so narcissistic that they have actually made I-pad recording videos of themselves teasing themselves with their own bare feet and then masturbated to the self-made videos.
Named after someone who is actually
literally named footmaster on DeviantArt.
"It seems that if someone on DeviantArt isn't a footmaster, he's usually either a gaymaster, a voremaster, a fatmaster, a fartmaster, or some other random fetish that I can't remember off the
top of my head right now..."
Basically, a compound
word of "foot" and "masturbation"; in other
words, one who masturbates to feet.