English · Slang Attested 18+

backsack

In real, traceable use. Part of the curated seed collection; community review is coming.

Meaning · English

The back of the testicles.

⚠ Register: slang, vulgar

Where it’s used: Used American English

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Common questions

What does “backsack” mean?

The back of the testicles.

Is “backsack” formal or informal?

backsack is generally slang, vulgar.

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