On the backside of a boulder to the left and slightly under the blue path, between the characters "C" (boulder of Le Baroudeur) and "D" (boulder of Synapses). Sitstart at a characteristic small cave, take a vague angle (without using pocket on the left by convention), traverse to the right and exit as for Waf-Waf (droite).
NB: the version with the pocket on the left is slightly easier.