What are semi boners?

How do you get them? Can you get them just by looking at a girl with a nice butt in public?
do you adjust them to hide it?
how long does it last?
and is there a bulge visible?

I was shopping with my boyfriend and there was this woman with a HUGE ASS and thighs
I was like dang how is it that big
and we kinda looked
I noticed him adjust kinda and a quick bulge right after?
Maybe I'm overreacting because my boyfriend always randomly adjusts
and he said the girl wasn't hot
Updates
+1 y
It's funny how you all think it was 100% a boner
I don't think it was
What are semi boners?
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