a combination of the words 'badonk-a-donk' and 'binoculars'. basically, a tool used by those with bad vision to verify if a girl has a nice ass from a distance.
"hey man, check that girl out, she's a looker!"
"eh, i dunno, better get out the badonkulars, just in case..."
Sounds like "Binoculars". Like Beer Goggles for staring at a woman's ass, typically a chick with a flat or weird shaped ass, that looks amazing when drunk.
Dude 1: "bro you were grabbing flatty Maddie last night!"
Dude 2: "I don't give a flying fuck, I saw her with my badonkulars on!!"
the quality and or asset of having a rather large and juicy, quite bubbly and perfect ass-et. So much so that it wanna make a OG wanna cry. or holla. at least thru myspace. Also, "amazing" if it has anything to do with getting booty.
tatis ass is badonkulous. scratch that, her body is badonkulous. then agen, my saturdays with her are badonkulous too.