Looking under skirts, or down shirts to get a peak of a naughtypart.
While on the escalator, Fundo used his camera phone to get a photographic sneakpeak under the skirt of the female standing 3 steps ahead of him. Fortunately for him, she wasn't wearing panties.
250ml (approx 8.5 US fl. oz.) bottle of beer, also known as a stubby. Named for the ease with which one can sneak it into any establishment where it is prohibited (on account of its small size). Usually cheap and low quality. Available in crates of 20 bottles from shops such as Tesco and Lidl.
"Shit, I can't afford to be buying pints all night. Maybe I'll just smuggle in a sneaky or ten."