OS:  As OldSchool pointed out above in his post, " by using a 1950s phrase that's really a pejorative for a man whose gay "trip" you so despise", Yes, "light in the loafers",  means you are homo,  gay, lesbian, Trans-mutilated, he/she, she/he, messed up.    Not my cup of tea.  

I do not  know what definition you have in mind about, "are you heavy in your boots", but you can call me whatever you want.............