From Wiktionary, the free dictionary
Ultimately from Proto-Slavic *-akъ. Compare Polish -ak, Czech -ák, Russian -а́к (-ák).
־אַק • (-ak)
- denotes a person with a given characteristic, usually colloquial and/or derogatory in nature
- פֿרום (frum, “religious”) + ־אַק (-ak) → פֿרומאַק (frumak, “religious Jew”)
- צָבוּעַ (tsavúa, “hypocritical”) + ־(אַ)ק (-(a)k) → צבֿועק (tsvuak, “hypocrite”)