If I’m somewhere other than home… I might flick it to the ground if I have no tissue or other paper options.
Also, yes I have no problem re-using a tissue for other boogers and snot-pieces later…usually by tearing off a piece that’s just big enough to receive the boogers and/or snot…this leaves the rest of the tissue for later usage. This is another aspect of that cheapskate lifestyle, see. Imagine how much extra you’re ultimately spending if you’re using up a whole tissue for just ONE booger every time.
sidenote–the most interesting ones—those boogers that look like they have a “snot-drip/bag” attached…usually you dig the crusty booger out but it drags out this long “bag” shape of snot with it. Then there’s those little “silly putty” types that are extra sticky for some reason…because of the adhesive quality there…it’s usually tough to flick those like a normal booger…they HAVE to be wiped onto a tissue…heh, those are funny.
*Also, I just remembered a classic grade school memory— the 4th grade teacher actually called out this one kid for it–I think she did this purposely for laughs at his expense… she looked over and loudly said “DON’T WIPE THAT BOOGER OFF ON THAT SEAT!” and of course the whole class laughed.