وَهَدَرَتْ شَقَاشِقُ ارْتِجَالِهِ
And the loud swell of his improvised speech resounded.
Shaqāshiq evokes the inflated throat structures and sounds associated with a bellowing camel; hadarat suggests a resonant roar. Irtijāl is speaking extemporaneously, without a prepared written speech.
The figurative image conveys the force and spontaneity of his oratory, not an actual animal sound.