Definition

Energy, vigor, or impact; the force or emphasis behind something, whether physical, emotional, or rhetorical.

Example Usage

This presentation needs more oomph—add some bold colors and cut down the text.

Origin

Likely onomatopoetic, mimicking a heavy sound or impact; first recorded in English in the early 1900s.

Fun Fact

The word has been used in marketing for decades; Ovaltine's mascot 'Oomph' and similar branding played on its energetic connotations.

Source: Definition backfill (hailey)