One who does more than his/her fair share of whining and/or complaining, much like that of a toddler in a high chair. A spoonbanger--in adult terms--may be a stubborn person who complains about everyday functions.
It was impossible to get that spoonbanger to bong a beer last night.
(noun) A combination of the words 'spoon' and 'poontang'. 'Spoon' representing a sexual position where one partner is held in parallel (also referred to as '66' or '99'), and 'Poontang' meaning the vagina, and more generally, intercourse. Usage is rare, following the same rules as 'poontang', and simply specifies a certain position to be used.
"Going home to get some spoontang from the old lady."
NOTE:
"On Sunday mornings, I like to spoon with my girl"
compared to,
"On Sunday mornings, I like to get some spoontang."