the third degree of roughness in the scale:
minger, mingerola, semi-conga, momma-conga
with 'minger' being a 1 on the scale of roughness, and momma-conga being a 4. Thus, semi-conga is a 3 - bad but not the worst.
"That girl I pulled last night was a mingerola."
"No way, she was worse than that. A semi-conga."