A wankbot is a person who is so eager to wank off himself and others around him that people refer to him as a wankbot because it's so mechanical and androidlike now.
A wankbot usually has really weird tendencies like goosestepping round rooms naked just to show off his penis and hope that others will drool over it.
"Wankbot, can I have a handjob?" "Yeah sure, after I finish this person off."
Used in conjunction with Motherfucker. A term for a nut who wanks. Frequently. Often used as derogatory. However, in extreme circumstances can be a compliment.