Enables GTPase activator activity; protein homodimerization activity; and small GTPase binding activity. Involved in plasma membrane bounded cell projection organization and positive regulation of GTPase activity. Located in several cellular components, including phagocytic vesicle; postsynaptic density; and postsynaptic membrane. Is expressed in several structures, including brain; eye; future spinal cord; heart; and spinal cord. Orthologous to human SRGAP2 (SLIT-ROBO Rho GTPase activating protein 2). [provided by Alliance of Genome Resources, Apr 2022]