where did the phrase "fuck spider" come from?

for fun, laughter, peace and joy

last nite
i was out with my galfren
being stressed out at work
scattered-brain for the whole day
having a pimple outbreak
and being refused entry to yoga class
all at the same time
she was kinda, u know,
aggressive
and having not met up for quite some time
we had loads to update each other
and she was telling me some of her grievances at work
and somewhere in the conversation
i thought i heard her mention the phrase "fuck spider"
it didn't strike me at that particular point in time
but on my way home
that part of the conversation containing the phrase
suddenly struck me
i heard my bf use it before
and i tink i heard it somewhere before
but u know, as usual
u noe dat vulgarities are vulgarities
being used to express certain emotions
(mainly frustrations)
but most of them is nothing but an expression
and has no real meaning to it
in fact, i found it amusing whenever i hear the phrase
spider so small , how to fuck?
so, i guess it’s like kinda insulting to someone
if u ask him to go fuck spider
oh well, i guess vulgarities are meant to be insulting
but last nite as i thought about the phrase
i was juz tinking
why spider?
most (hokkien) vulgarities include genitalia
be it male or female genitalia
but somehow
dat’s the most common and “popular” vulgarity
maybe this vulgarity (fuck spider) is English
and not hokkien
dat's why
but still
why “spider”?
i brushed it off as a passing thought
but to my surprise
after 1 night’s sleep
and more than half the day gone
the question popped up in my head
juz moments ago
prompting me that my sub-conscious mind
is craving for this curiosity to be satisfied
and so, i typed the phrase “fuck spider”
into the trusty google search engine
and some light was shed
lol

The below definition is extracted from
The Coxford Singlish Dictionary

FUCK SPIDER
Of uncertain origin, this term often connotes extreme frustration. The general consensus is that it originates from the Army (the source of many creative Singlishphrases), where a "spider" was dirt in the barrel of one's rifle. If during inspection, you found a "spider" in your rifle, you'd have to strip it and clean it all over again. Hence, "fuck spider" would either be a common expletive amongst recruits, or an exhortation by an annoyed inspecting officer/NCO. Some, however, believe itdates back to an old practice amongst boys to catch spiders in the undergrowth, house them in small boxes and make them fight.