You use it when you wanna go take a shit, but don't want to be so direct, much like "to lay a brick". It's not really used nowadays, given the fact that no one really uses fax anymore, but who cares.
Imagine you're having a conversation of some sort, and you wanna take a shit:
-Please excuse me, I just remembered I have to send a fax.
April 20th is national titty pics day. Where you send a titty pic to a loved one or someone you feel needs a titty pic
person 1: Ay yo todays April 20th send a titty pic day
person 2: dw i gotchu fam *sends a titty pic*
person 1: thank you so much *sends a titty pic*
When you eat THC gummy edibles and are high enough to accomplish a difficult feat
I’m about to go full gummy send on this burger.
Send me some cigars, and promise I’ll shut the fuck up
Send me some cigars
Take a shit.
Pass faecal matter.
Greg: Hey Gaz you coming or not? Hurry the f*#k up.
Gaz: Yeah mate just wait a minute I gotta send a fax to Canberra.
when someone sends a ninja fart
while in an elevator:
"hey man why did you send a koener here bro"
When you're in DMs with someone and accidentally send the message to the wrong person. Like accidentally sending something to your BFF when you meant it for your crush.
(in DMs with BFF)
"hey, so i was thinking about our relationship..."
"oh my god you're in a relationship with me"
"shit wrong send" (deletes messages)