noun, masculine/wa.lɛ̃.ɡɑ̃/plural: wallingants
Wallonians supporting Wallonian independence; coined by their opponents.; A passionate defender of French culture and language, especially in Belgium.
“...la definition de Jean-Pierre Hiernaux, qui présente le « wallingant » comme un «défenseur radicale ou excessif de la langue et culture français, dans la Belgique unitaire telle qu'issue de la révolution de 1830 ». Hiernaux (J.-P.), « Wallingant, wallingnantisme », in EMW, o.c., pp. 1619-1624.” — ... Jean-Pierre Hiernaux's definition, which presents the "wallingant" as a "radical or excessive defender of French language and culture, in unitary Belgium as it appeared in 1830 revolution".
From Wallonie, by analogy with flamingant.