Bajoinker Share definition Flag A describing word for a "boner" or a "Johnny Rocket," and extremely hard erection which causes severe pain and shows through your pants. "Did you see Mike? He has a HUGE Bajoinker." "I play with my Bajoinker" "She gave Sam a Bajoinker" Bajoinker by dunit April 12, 2005 0 0 Get merch Get the Bajoinker mug. Buy Now — $32.95 See more merch