use responsibly...

yo.sh

#!/bin/bash

if [ ! -t 0 ]; then
    user=/dev/stdin
elif [ $1 ]; then
    user=$1
else
    echo "Usage: $1 [username <string>] $2 [-m msg <string>]" 1>&2; exit 1;
fi

if [ $2 ]; then
    msg=$2
else
    msg="you_out_the_squad" # your username here
fi

if [ $3 ]; then
    i=$3
else
    i=1
fi

x=1
while [ $x -le $i ]
do
    curl -X POST http://yofor.me/$user/$msg
    echo "Welcome $x times"
    sleep 1
    x=$(( $x + 1 ))
done