Go tensile test yourself

[Justin Bieber]

[Engineers] euphemism of Go f--- yourself.
A tensile test is where make a special specimen of whatever material you want to test, and you put it in a tensile testing machine. [The machine] slowly strains (elongates) the specimen and measures how the specimen responds, ie how much force it goes under. The machine makes a [graph] of the stress-strain behavior, where stress is force divided by the cross-section area of the specimen.
This is the very finest way to tell an engineer to get lost.