aand mat chaba Same as paka mat, although “aand” means the skin on the scrotum. Variation: aandwa. “Wear your seatbelt ya! Pandu pakdega toh aand chabayega”.
babaji ka ghanta Balls! From a nude babaji (holy man)’s gently swaying junk. Often shortened to just ghanta, meaning zippo, “yeah, right”.
bakchodi Generally faffing, talking rubbish, doing nothing or “taking someone’s trip”. “We didn’t do anything productive, we were just doing bakchodi.”
champu A dorky looking person, with oiled hair, thickrimmed specs and so on.
chop To be humiliated or distressed. “I tripped on the marble and fell face-first. Itni chop hui.
gajkaran Someone who loves Itchguard.
heights Often used in an exclamation indicating something like, “This is too much!” A stand-out line from Jab We Met where a characater proclaims, “Yeh toh heights hai!”
lenduk Literally, a turd
matka maarna To bunk. “Aaj physics ko matka marte hain yaar.”
matter hona The patois version of, “something has happened”. “Arre solid matter happened in the building after the Holi party.”
raita phail gaya The shit hit the fan. “The princi caught us smoking in the loo – raita phail gaya.”
todu A multi-tasking word with several variations. Runs the gamut from “great” to “excellent” to “fantastic”. The degree varies with the number of notional exclamation marks at the end of the delivery.
More here. There's also a Twitter hashtag where you can #bolbambai