stamp collecting 

An frivilous pursuit requiring only time and the ability to repeat things verbatim like a Parrot.

See Botany, Microbiology and Art.

Ernest Rutherford (1st Baron Rutherford of Nelson and known as the "father" of nuclear physics) was quoted as saying:

"Physics is the only real science. The rest are just stamp collecting."

stamp collecting by Chaucer_had_it_coming February 1, 2010

Stamp Collecting 

To go from bar to bar collecting hand stamps at the entrances.

This weekend we're going bar hopping or stamp collecting.

Stamp Collecting by GUNNER636 January 23, 2009

Stamp Collection 

A sexual innuendo for the male genitalia sent to a person of opposite sex as a picture who does not want it but receives it anyway.

"Hey girl, do you want to see my stamp collection?"
"Yesterday, the weirdest thing happened. John asked me if I wanted to see his stamp collection. I didn't know he collected stamps."

Stamp Collection by Pantslesspuma July 4, 2017