Basically a hand job as used as a last resort or as barter or trade.
When she won't have sex with you or give your oral pleasure you could at least settle for a "hand dooker" not that great but at it's better than nothing usually preformed with no lube but not always. Hand dooker may also be used to bribe a friend.
Friend: What happened with you and Julie?
"She said no sex on the first date so I settled for a hand dooker instead
" I'll trade you a hand dooker for some of those cool ranch Doritos".