«يَا أَرْضِ اشْتَدِّي مَا عَلِيكِي قَدِّي»

The speaker pictures a braggart addressing the ground itself, ordering it to stay firm beneath him because no one upon it matches his rank or worth, as though his weight and might could make it buckle. The image inflates one person's self-regard until it rivals the earth, showing how absurd that vanity looks.

In practice the line mocks a person who is dazzled by his own power and parades it before others. Putting the boast in his mouth exposes his conceit; it is a rebuke of arrogance, not praise of real strength.

Use it to poke fun at someone swaggering about their strength or importance, often by voicing their imagined boast back at them. It suits teasing or pointed criticism of arrogance, not sincere admiration. Said about oneself, it sounds boastful unless the jest is obvious.