stimming on
v.— «Nick started to walk on his toes, trail his hands on walls and developed an obsession or “stimming on” (in the parlance of those who deal with the correction of autistic behaviour) arranging boxes in rows or in neat piles.» —“‘Normal’ on the outside” by Merina Hew New Straits Times (Singapore) Feb. 9, 2000. (source: Double-Tongued Dictionary)