Contemptible or inneffectual person. Can be used in place of wanker or tosser or bastard.

May also refer to someone who claims to be able to achieve something impressive or improbable

(general definition) - A young male so lecherous that he is suspected of having regular intercourse with any number of females from every walk of society. This he accomplishes because he solicits everyone and everything for sex, and scores on volume. always at the ready, he wears clothes convenient for the purpose (such as loose-fitting polyester basketball shorts), and, although usually poor, maintains a lifestyle that affords him every opportunity to solicit and have sex at a moment's notice. This includes mutiple cell phone accounts (typically nextels or other push-to-talk devices), a low-skill job allowing for heavy domestic interaction (such as installing satellite dishes), and very poor personal hygiene, as it cuts into his fuck-time.
A fuckdog is nearly always a redneck and can often be identified by a perpetually unkempt cat-'stache. When sexually engaged, he typically leaves the premises before his ejaculation is fully complete, shouting 'SPLOOGE!' as he achieves orgasm (though this happens so quickly that by the time he shouts 'splooge!' he is often trailing his voice down the hall and out the door, on to the next easy conquest). It is difficult for a fuckdog to keep any plans or appointments, since the slightest prospect of sex will lead him astray.

(proper noun) - Fuckdog (capitalized) is a nickname borne by a specific legendary individual who inhabits the deep South. Much like the Yeti or the Loch Ness monster, Fuckdog figures prominently in regional oral...