A uvular–epiglottal consonant is a

doubly articulated consonant Doubly articulated consonants are consonants with two simultaneous primary places of articulation of the same manner (both plosive, or both nasal, etc.). They are a subset of co-articulated consonants. They are to be distinguished from co-articul ...

pronounced by making a simultaneous

uvular consonant Uvulars are consonants articulated with the back of the tongue against or near the uvula, that is, further back in the mouth than velar consonants. Uvulars may be stops, fricatives, nasals, trills, or approximants, though the IPA does not p ...

and

epiglottal consonant A pharyngeal consonant is a consonant that is articulated primarily in the pharynx. Some phoneticians distinguish upper pharyngeal consonants, or "high" pharyngeals, pronounced by retracting the root of the tongue in the mid to upper pharynx, ...

. An example is the Somali "uvular" plosive , which is a voiceless uvular–epiglottal plosive , as in 'to emit smoke'.Supraglottal cavity shape, linguistic register, and other phonetic features of Somali
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References

Place of articulation Uvular consonants Epiglottal consonants Doubly articulated consonant {{phonetics-stub