hot on

1. Also, hot at . Very good, impressive, as in He's hot at anything involving numbers . This expression, first recorded in 1573, is frequently used in the negative, as in I'm not so hot at new computer programs .

2. Also, hot for . Enthusiastic about, as in She's really hot on golf , or He's hot for another skiing vacation . This seemingly modern slangy usage was first recorded in 1667. Also see make it hot for .