The clip comes from Samson & Gert, the long running Flemish children's programme built around Gert Verhulst and his puppet dog Samson, whose mangled speech and catchphrases became part of growing up in Belgium and the Netherlands. Mwoah Gertje was one of Samson's regular ways of addressing Gert, so fans recognise it immediately. As older episodes and clips circulated online, the short line escaped its children's show context and became a nostalgic soundboard staple, reused whenever a doubtful or reluctant reaction fits better than a full sentence.
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Mwoah Gertje is Samson's funny catchphrase from Samson & Gert, used as a short reaction sound for confused, doubtful or playful moments in memes.
Mwoah Gertje is a very short clip of Samson, the talking dog from the Flemish children's series Samson & Gert, answering his owner in his familiar hesitant way. The drawn out mwoah sounds unsure and slightly put out, like he is thinking hard before agreeing to anything. That small pause and whiny tone make it instantly recognisable to anyone who grew up with the show. Used outside the series, it works as a gentle joke reaction, turning a simple reply into a moment of comic doubt, confusion or reluctant acceptance.