Adjective;

As in reference to the British tank used in WWII, now denotes large females found at parties and other social gatherings (especially involving alcohol) that attempt to get play from unsuspecting males. Often, they are slow and clumsy, and are always extremely bulky. Approach with care.

a PCP cigarette (see sherm) referneced in Peter Frampton's classic rock anthem do you feel like we do

Noun: An American. Cockney rhyming slang: Sherman Tank - Yank. Real Cockney rhyming slang only uses the first word, which sounds nothing like the thing being referred to in the rhyme so secrecy is preserved.

A slang term for illegal hallucinogenic mushrooms (aka "shrooms" or "magic mushrooms"). Often used as a code word for telephone conversations or conversations in public settings where talk of illegal activities could get one in trouble.

In such conversations Sherman is often referred to as a person, such as saying "is Sherman around?" to ask a dealer if he/she currently has any shrooms available for purchase.

slang, in refrence to a Sherman Tank, so Sharman Tank = wank

Kind of ambiguous, but generally meaning cool.

The act of doing something mischievous or incoherent while under the influence, intoxicated, or when something is wrong inside of the brain.

a horrible feeling after sexual intercourse