Definition

The lowest rank in a hierarchical ranking system; something that is poor quality, undesirable, or the worst of its kind. The opposite of top tier or S tier.

Example Usage

That budget laptop is bottom tier—it can barely run web browsers without lagging.

Origin

From 'tier' ranking systems; 'bottom' indicates the lowest position in a quality hierarchy.

Fun Fact

Often used humorously in tier lists to rank pop culture, foods, or characters in the most unflattering category.

Source: Definition backfill (hailey)